Instruction Manual



    1. Fitting the CRB7 to your Router
    2. Fitting the Indexed Rule to the CRB7
    3. Micro Adjuster
    1. Adjustable Dadoing with a Clamp Guide
    2. Adjustable Offset Mortising
    3. Anti-Tilt Support
    4. Adjustable False Panel Groove Copier
    5. Offset Baseplate
    6. Cutting Small Circles Radius 3/4" (19mm) - 8 13/16" (224mm)
    7. Using the CRB7 with the TREND Varijig & Routers with Euro style Guide Bush Fittings.
    1. Cleaning
    2. Lubrication
    3. Storage


Thank you for purchasing the MPOWER Combination Router Base (CRB7) we hope you enjoy using it. The CRB7 should give lasting performance if used in accordance with these instructions.

The following symbols are used throughout these instructions.

Denotes risk of personal injury, loss of life or damage to the tool in case of nonobservance of the instructions.

Refer to the instruction manual provided with your power tool.


Please read and understand the safety points at the end of these instructions as well as the power tool instructions before use.


Users must be competent in safe routing practices before using this products.


This accessory is a retro fit, quick change, multifunctional router base for use with routers that:

  • Accept two 5/16” (7mm) rods.
  • Has router base rod hole height between: Min 15/64” (6mm) Max 1 19/64” (33mm)
  • Has router base rod hole centre spacing between: Min centres 1 11/32” (34mm) Max centres 6 7/8” (174 mm).

The CRB7 Combination Router Base is intended to:

  • Increase the overall versatility of the router.
  • Improve the quality of finish of every routing pass.
  • Reduce the possibility of error.
  • Increase stability during routing.
  • Increase the level of precision achieved.
  • Save set up time between tasks.
  • Save space on storing hand made jigs.


  1. Adjustable Dado/Trenching with a Clamp Guide.
  2. Adjustable Mortising for material 2” (50mm) to 4 5/16” (125mm).
  3. Adjustable Anti-tilt support.
  4. Adjustable False Panel Groove Copier.
  5. Offset Baseplate.
  6. Router Compass Radius 3/4” (19mm) to 8 13/16”(224mm). Measured from outside edge of hole and using a 1/4” (6mm) cutter.
  7. Using the CRB7 with euro style guide bush fitting routers with the TREND VariJig and a long series guide bush.

Note: All dimensions shown are based on a T5 router being used with a 1/4” (6.3mm) router cutter.


  • Router with a suitable rod size and centres.
  • Router cutter.
  • Clamps.
  • (1/2”) 13mm A/F open ended spanner x 2.
  • (5/16”) 8mm A/F open ended spanner.
  • Hand Tools.


  1. 1.   Bridge - Attaches the guide rods to the baseplate.
  2. 1B. Bridge Shim - Spaces the bridge and baseplate.
  3. 1C. Bridge Slot - Provides lateral adjustment.
  4. 2.   Baseplate - 5mm acrylic platform of the CRB7.
  5. 2B. Baseplate Letterbox - Router cutter zone.
  6. 3.   Bridge Pinchbolt - Secures the offset handle and anti-tilt leg to the bridge.
  7. 4.   Micro Adjuster - Attaches to the adjuster rod and micro adjusts the position of the router.
  8. 4B. Micro Adjuster Lock Nut – Locks the micro adjustment securely in position.
  9. 5.   Adjuster Guide Rod - Attaches to the bridge via the adjuster rod crank plate, adjuster rod and micro adjuster.
  10. 5B. Adjuster Guide Rod M5 Locknut – Attaches the adjuster guide rod to the adjuster guide rod crank plate.
  11. 5C. Adjuster Guide Rod M5 Washer x 2
  12. 5D. Ajuster Rod – Attaches to the adjuster guide rod to the bridge via the micro adjuster.
  13. 5E. Adjuster Rod Crank Plate – Fixes the adjuster rod to the adjuster guide rod.
  14. 6.   Fixed Guide Rod - Attaches to the bridge via the crank plate and fixed rod.
  1. 6B. Fixed Guide Rod M5 Locknut – Attaches the fixed guide rod to the fixed guide rod crank plate.
  2. 6C. Fixed Guide Rod M5 Washers x 2.
  3. 6D. Fixed Rod – Fixed to the bridge can be moved within the bridge slot to accommodate various router rod spacings.
  4. 6E. Fixed Rod M8 Locknut x 2 - Locks the fixed rod in position on the bridge.
  5. 6F. Fixed Rod Crank Plate – Fixes the fixed rod to the fixed guide rod.
  6. 7.  Offset Handle - Fits into bridge when in offset baseplate mode.
  7. 8.  Anti-tilt Leg - Fits into bridge stabilizing the unsupported side of the router.
  8. 9.  Pivot Pin - Fits to the underside of the baseplate, forms the axis point when routing arcs and circles.
  9. 10. Mortise Pillars - Attaches to the underside of the base and guides the CRB7 when mortising.
  10. 11. Indexed Rule - Self adhesive for user fitting.
  11. 12. No.6 x 1/2” Csk Woodscrews x 6 - Secures the copy tongue batten to the baseplate.
  12. 13. M4 x 10mm Csk Screws x 3 - Fixes the pivot pin and mortise pillars to the baseplate.


Fitting the CRB7 to your Router

Before use please remove protective film from the CRB7 baseplate.

Due to the large number of different router models and their differing base and rod configurations an initial CRB7 set up is required.

CRB7 Router Set-up

  1. 1,  Loosen the micro adjuster lock nut (4B).
  2. 2,  Loosen the fixed rod lock nut (6E) and move the fixed guide rod (6) temporarily to the far end of the bridge slot.
  3. 3,  Slide your router onto just the adjuster guide rod(5) and ensure the router cutter sits comfortably within the parameters of the
  4.      baseplate letterbox (2B).

If the router cutter sits comfortably within the parameters of the baseplate letterbox (2B) slide the router off the adjuster guide rod (5) and go to step 7.

If the router cutter doesn’t sit within the parameters of the letterbox lift the router on the rod so that it flips the crank plate (5E) over. This will re-position the cutter within the letterbox.

If the cutter sits within the letterbox (2B) slide the router off of the adjuster guide rod (5) and go to step 7.

Now if the cutter still fails to sit safely within the letterbox; you will need to move the adjuster guide rod (5) to the other fitting hole (5E1 or 5E2) in its crank plate (5E).

  1. 4, Slide the router off the adjuster guide rod (5).
  2. 5, Undo the adjuster guide rod M5 nut (5B) with an 5/16” (8mm) spanner.
  3. 6, Re-position the adjuster rod (5) and re-tighten the nut (5B) slide the router back on and re-check to ensure the cutter sits
  4.      comfortably within the baseplate letterbox (2B). When correctly positioned slide the router off the adjuster rod (5).
  1. 7, Align the fixed rod (6) with the router rod drilling and slide the router onto both guide rods (5 & 6).
  2. 8, Tighten the routers rod knob (A) onto the adjuster rod (5)
  3. 9, Finger tighten the M8 nut (6E1) on the fixed rod (6D).
  4. 10, Tighten the routers rod knob (B) onto the fixed rod (6).
  5. 11, Lock in the fixed rod position by using 2 x 1/2” (13mm) spanners (1 x open ended) and tighten the M8 nuts (6E1 & 6E2)
  6.       either side of the bridge (1).

Your CRB7 is now set-up and ready to use.

Fitting the Indexed Rule to the CRB7

Included with the CRB7 is a self adhesive indexed rule (11), when fitted to the CRB7 baseplate (2) it will allow the user to see and reposition the router to a measured distance relative to its original position.

Many routers are manufactured with a cast indexing line or marking positioned centrally on the side of the router base (11A). If the router has no indexing line and you wish to utilize the indexed rule (11) simply draw a line on the base using an indelible fine black marker.

With the router fitted to the CRB7: Position the indexed rule (11) to run alongside the edge of the router base on the fixed guide rod (6) side so that a reading can easily be taken from the index line (11A) on the router base to the indexed rule (11).

When happy with its location ensure that the baseplate (2) is free of dust and debris, peel off the indexed rule (11) backing paper and carefully stick in position.

Micro Adjuster

The CRB7 is fitted with a micro adjuster (4). The micro adjuster is designed to provide greater accuracy when positioning the router cutter prior to use.

Using the micro adjuster (4) to accurately position the router cutter.

  • Plunge the router cutter to a level just above the surface of the workpiece and lock the router cutter height in that position.
  • Loosen the router fence rod knob holding the fixed guide rod (6) and keep the router fence rod knob locked on the adjuster guide rod (5).
  • Rotate the micro adjuster (4) to align the outer edge of the router cutter precisely with the desired marking.

Positioning the router cutter using the index markings on the CRB7.

The micro adjuster (4) has an indexed line (4A) machined across its width (in red), 1A similarly a corresponding index line (1A) is located on the bridge (1) either side of the micro adjuster (4).

When the micro adjuster (4) is rotated once it will move the router 50/1000 Inch (1.25mm) from its original position. Four complete rotations will move the router 3/16” (5mm) etc.

It’s essential to remove the play from the thread when using the index lines.

Loosen both router fence rod knobs and turn the micro adjuster (4) in the desired direction so that both index lines (1A & 4A) line up.

Retighten the router fence rod knob on the adjuster guide rod (5).

The router cutter can now be moved a measured distance accurately using the micro adjuster (4). Should the router cutter need to be adjusted in the opposite direction repeat the above step to remove the play.

Tip: To remove float or backlash in the adjuster rod (5D) and micro adjuster (4) simply tighten the micro adjuster locknut (4B) against the bridge (1).


Adjustable Dadoing with a Clamp Guide

Using a clamp guide and router to rebate across the width of a work piece is a useful and common practice. However considerable time is taken to accurately set the clamp guide at right angles to the edge of the board simultaneously ensuring a precise distance from the desired position of the rebate. The CRB7’s micro adjuster (4) removes the need to set the distance between clamp guide and rebate.

Ensure the clamp guide (J) is set at right angles to the board edge and within the range of the routers movement on the CRB7’s guide rods (5&6). Slide the router to the approximate position of the required rebate and using the router fence rod knob (I) on the router base lock the router onto the CRB7’s adjuster guide rod (5). Plunge the cutter to the work piece surface (with the router turned off) and using the micro adjuster (4) bring the edge of the cutter up to the line denoting the location of the rebate. Run the bridge (1) end of the CRB7’s baseplate (2) up against the clamp guide (J) and using an even pressure ensure the router moves smoothly down the length of the clamp guide.

If a deep rebate or groove is needed several lighter cutting passes may be required.

If two grooves are needed within 11/32” (110mm) centre to centre of each other, (using a 1/4” cutter) they can be routed without moving the clamp guide by simply sliding the router down the CRB7’s guide rods (5&6) to the next location.

Before use ensure router fence rod knobs are tightened onto the CRB7 guide rods.

Always isolate router from power supply before adjustments or during set ups.

Adjustable Offset Mortising

The CRB7 fitted with mortise pillars (10) saves time and gives a clean finish. Note: Maximum material width 8 5/8” (219mm) using mortise positions (C) and (H).

Material widths 2” (50mm) - 4 59/64” (125mm)

  • Fit the mortise pillars (10) to the underside of the baseplate (2) in locations (F) using the two x M4 screws (13) provided.
  • Mark out the required mortise dimensions onto the work piece.
  • Fit the cutter to the router and refit the router onto the CRB7.
  • Place the CRB7 onto the section of wood to be mortised with a mortise pillar (10) on either side of the work piece. Rotate the CRB7 clockwise until both mortise pillars (10) are in contact with and tightened against the sides of the work piece.
  • Position the router so that the router cutter (K) sits between the mortise pillars (10) and roughly lines up with the mortise markings, if happy fix the router in position by locking the router fence rod knobs on both the fixed guide rod (6) and the adjuster guide rod (5).

If the router requires final adjustment plunge and lock the router so that the cutter tip is just in contact with work pieces surface and use the micro adjuster (4) to accurately set the cutter position.

It’s important to ensure that the mortise pillars (10) remain in contact with the work piece sides along the complete length of the mortise. If the position of the mortise is at the very end of the work piece then additional guide battens (L) will need to be fitted to prevent the mortise pillars (10) literally falling off the end of the work piece.

Clamp one guide batten (L) on each side of the work piece, over lapping the ends. This will give a wider and longer platform to support the router.

Depending on the depth of mortise and material being used, several cutting passes may be required in order to achieve the correct depth safely.

  • Plug the router into the power supply.
  • Twist the router and CRB7 in a clock-wise movement tightening the mortise pillars (10) against the sides of the work piece.
  • Switch on the router.
  • Plunge the router cutter (K) into the work piece and feed the machine forwards again ensuring that the mortise pillars (10) are in contact with each side of the workpiece.
  • At the end of the mortise, turn off the router and release plunge.
  • Reset the router cutter depth and repeat until the required mortise depth is achieved. n Switch off router.

Material widths 4 59/64” (125mm) - 8 5/8” (219mm).

Fit the mortise pillars (10) to the underside of the baseplate (2) location (C and D or C and H) using the two M4 screws (13) provided. Then follow the same instructions as above.

Anti-Tilt Support

The CRB7’s anti-tilt leg (8) is designed specifically to aid stability when routing narrow sections of material. The leg is in two parts so its height can be reduced if required.

  • Slide the anti-tilt leg (8) into the bridge pinchbolt hole from the underside of the baseplate (2).
  • Lock it in position with the plastic foot up against the underside of the baseplate (2).
  • Slide the router onto the CRB7’s guide rods (5&6) and lock the router in position using the router fence rod knobs (I).
  • Ensure that the router is positioned to allow the router cutter (K) to sit safely within the baseplate letterbox.

Maximum support height = 3 1/8” (80mm)
Minimum support height = 5/16” (8mm)

  • Set the depth of the cutter as usual and rest the router on the work piece (M) as if to start a routing pass.
  • Release the bridge pinchbolt (3) so the anti-tilt leg (8) drops down and the foot rests on the bench top.
  • Without moving the router or anti-tilt leg (8) retighten the bridge pinchbolt (3) locking the anti-tilt leg (8) at the height which will then support the previously unsupported side of the router.

Before completing the routing pass check that the bench surrounding the work piece is smooth and even. Complete a couple of dry runs with the router around the work piece ensuring that the anti-tilt leg (8) has a clear path and the router remains stable whilst the pass is completed.

Adjustable False Panel Groove Copier

To repeat a routing pass a set distance from another pass or to produce a series of closely routed groves or rebates can be efficiently achieved using the false panel copy tongue feature. The CRB7 can be set up easily for this purpose.

Machine up a small section of copy batten (N) min. 6 5/16” (160mm) length in timber or a solid plastic i.e. nylon or polyethylene. The copy batten should copy the size and profile of the router cutter (K) that is to produce the groove. Test the finished copy batten in a sample groove to ensure a snug but not tight fit is achieved.

Using a clamp guide or side fence set up; rout the first groove on the workpiece, then:

Using three No.6 woodscrews (12) line up the copy batten (N) with the three countersunk holes (locations C & E) located in the baseplate (2) at the opposite end to the bridge (1) and screw the copy batten (N) to the underside of the baseplate (2).

To avoid threading the small section copy batten (N) screw it in position by hand not with a drill driver.

Fit the CRB7 to the router. Check that the copy batten (N) slides into the first groove and moves smoothly along its length. Set the required distance between the router cutter and copy batten (N) by sliding the router along the CRB7 guide rods (5&6) if necessary using the micro adjuster (4) to finely adjust it’s position then lock the router in place using at least one router fence rod knob on each side of the router base.

The 2nd groove can now be routed. In order to maintain accuracy use a consistent pressure when holding the router in position during each pass of the router.

Clean the 2nd groove and slot the copy batten (N) into it to produce the 3rd groove. Repeat as required.

Offset Baseplate

The offset baseplate function is designed to increase the router-base surface contact area to the work piece that’s being worked on improving stability and reducing the chance of making an error during a routing pass.

Slide the router onto the CRB7’s guide rods (5&6) and lock the router in position using the router fence rod knobs (I). Ensure the router is positioned at the far end from the CRB7 bridge (1) allowing the router cutter to sit safely within the baseplate ‘letterbox’. Fit the offset handle (7) into bridge pinchbolt hole and lock in position using the bridge pinchbolt (3).

The CRB7 is now set up and ready for routing.

The handle/bridge (1) end of the CRB7 should be centred over the work piece.

Cutting Small Circles Radius 3/4” (19mm) - 8 13/16” (224mm)

Routing out accurate circles that are smaller than the router base itself is a difficult operation. The CRB7 allows circles to be cut out easily from as small as 3/4” (19mm) radius up to 8 13/16” (224mm) radius.

Use baseplate hole C for circle radius approx. 3/4” (19mm) – 4 15/16” (125mm).

Use baseplate hole H for circle radius approx. 4 1/2” (115mm) – 8 13/16” (224mm).

Pivot Pin Storage:

The pivot pin (9) can be stored in the back of the bridge (1) when not in use. The M4 screw (13) must be screwed into the pivot pin (9) for the magnetic storage to be effective.

  • Fit the pivot pin (9) into the chosen countersunk hole in the baseplate (2) so that the pivot pin (9) protrudes downwards from the baseplate (2).
  • Mark out the desired dimensions of the circle/arc on the work piece.
  • Drill a 1/4 “ (6mm) hole at least 1/4” (6mm) deep in the work piece at the geometric centre of the desired circle/arc.
  • Place the CRB7 and router assembly onto the workpiece, ensuring that the pivot pin (9) is located in the drilled hole.
  • Slide the router along the guide rods (5&6) to align the router cutter with the marked circle/arc dimensions and lock the router fence rod knobs on either side of the router base.
  • Use the micro adjuster (4) to align the router cutter precisely with the marked circle/arc dimensions (see micro adjuster section).

Ensure that one router fence rod knob is secured either side of the router base and the router depth stop is set appropriately.

Minimum Radius (R) 3/4” (19mm) Hole C

Maximum Radius (R) 4 15/16” (125mm) Hole C

Maximum Radius (R) 8 13/16" (224mm) Hole H

Proceed to cut out the circle by rotating the CRB7 and router around the pivot pin (9). Depending on the workpiece material several shallow routing passes may be preferable.

For difficult or heavy cuts, the pivot pin (9) may be replaced with a countersunk No.6 woodscrew (12) secured into the workpiece. This No.6 woodscrew (12) should be a snug fit in the baseplate (2) to avoid ‘chatter’.

Tip: If it’s desirable to avoid a central drilling in the workpiece, use a 1/4” (6.35mm) thick overlay secured with double-sided adhesive tape or any similar method - e.g. cramps, screws etc - and drill a 1/4” (6mm) diameter hole in the overlay; then rout through the overlay and into the workpiece beneath.

Using the CRB7 with the TREND Varijig & Routers with Euro style Guide Bush Fittings.

The anti-tilt function of the CRB7 can be used as an alternative to the anti tilt shoe (included with the TREND Varijig). For routers that can accept Euro style guide bushes. A long spigot 40mm diameter guide bush (P) is required Ref. GB/40/B. The guide bush is fitted into the router guide bush recess. When routing out smaller rectangles narrower than 120mm, the increased size of the baseplate (2) provides sufficient area across the Varijig frame (O) and the anti-tilt leg (8) is not required.

In certain circumstances the router handle prevents setting the correct depth of the anti-tilt leg (8) however, the anti-tilt leg can be shortened as it’s a two part component, simply unscrew the top section and use the remaining shorter section.

A longer spigot guide bush must be used.

After use remove the CRB7 from the router and store carefully.


Please only use MPOWER original accessories.

Edging and Dowel Flush Trim Kit Ref: CRB/LIPTRI

An additional function of the CRB7 is a fast and accurate method of consistently trimming solid hardwood and iron on edging flush to its core panel. The kit can also be used to trim off the excess wood when using dowel plugs.


The accessory has been designed to operate over a long period of time, with the minimum amount of maintenance. Continual satisfactory operation depends upon proper tool care and regular cleaning.


  • Regularly clean jig with a soft cloth.


  • The CRB7 requires no additional lubrication.


  • The CRB7 can be stored in its packaging, or can be hung on a wall hook.


Recycle raw materials instead of disposing as waste.

Packaging should be sorted for environmental-friendly recycling. The product and its accessories at the end of its life should be sorted for environmental-friendly recycling.


All MPOWER products are guaranteed against any defects in either workmanship or material, except products that have been damaged due to improper use or maintenance.

Our policy of continuous improvement means that specifications may change without notice. MPOWER Tools Limited cannot be held liable for any material rendered unusable, or for any form of consequential loss.


  1. Disconnect power tool and attachment from power supply when not in use, before servicing, when making adjustments and when changing accessories such as cutters. Ensure switch is in “off” position. Always ensure cutter has stopped rotating.
  2. Read and understand instructions supplied with power tool, attachment and cutter.
  3. Current Personal Protective Equipment (PPE) for eye, ear and respiratory protection must be worn. Keep hands, hair and clothes clear of the cutter.
  4. Before each use check cutter is sharp and free from damage. Do not use if cutter is dull, broken or cracked or if any damage is noticeable or suspected.
  5. The maximum speed (nmax) marked on tool or in instructions or on packaging shall not be exceeded. Where stated, the speed range should be adhered to.
  6. Insert the shank into the router collet at least all the way to the marked line indicated on the shank. This ensures at least 3/4 of shank length is held in collet. Ensure clamping surfaces are clean.
  7. Check all fixing and fastening nuts, bolts and screws on power tool, attachment and cutting tools are correctly assembled, tight and to correct torque setting before use.
  8. Ensure all visors, guards and dust extraction is fitted.
  9. The direction of routing must always be opposite to the cutter’s direction of rotation.
  10. Do not switch power tool on with the cutter touching the workpiece.
  11. Trial cuts should be made in waste material before starting any project.
  12. Repair of tools is only allowed according to tool manufacturers instructions.
  13. Do not take deep cuts in one pass; take several shallow passes to reduce the side load applied to the cutter.

Manufactured by MPOWER Tools Ltd™

UK Design Registration 300363, US & EU Design Patents Pending, US, EU & UK Patents Pending

Manor Farm, Newton Tony, Salisbury, Wiltshire, SP4 0HA
Tel: +44 (0) 1980 629 526 - Email: - Website:

© MPOWER Tools Ltd™ 2012

available from
CRB7 Router Jig
Clamp Guide
Router Compass
Adjustable Mortising
Anti Tilt Support
Repeat Dado-ing
Off Set Base Plate