Saddle Routing Jig

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Saddle Routing Jig

Item # 4043
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Saddle Routing Jig

About This Item

Fast, accurate saddle installations! Slot an acoustic guitar bridge easily and accurately every time. A StewMac exclusive.

We designed this handy jig here in our shops, to solve the tricky router alignment problems you'll encounter when creating or correcting a bridge saddle slot.

It's become a repair shop "must-have," with versatile time-saving uses that will give you easy, accurate results every time.

Slot a new bridge
Slot for a compensated saddle—split saddles too!
Fix an incorrectly located saddle
Flatten the bottom of a slot for an undersaddle pickup
  (crucial for proper pickup response)

The jig works seamlessly with our Precision Router Base and your Dremel. Don't have a Dremel? An adapter for the popular Bosch Colt router is also included (you can drill it to fit other brands of laminate trimmers, too).

Simply clamp the jig at the guitar's soundhole and tailblock. It's made of clear acrylic for easy positioning, with sponge padding to help level the jig on arched soundboards. Thumbscrews allow precise fingertip adjustment of cutter alignment, saddle compensation, slot length and width. Clear acrylic adapter plates are included.

Instructions are supplied with the jig. Clamps, router base and Dremel not included.

TIP: Before using the jig, you'll need to know precisely where to rout. The Saddlematic and the Intonator take away the guesswork.

Trade Secrets!

Trade Secrets!

Finding the right location for a guitar's saddle slot

This issue shows how to locate and cut the saddle slot for an acoustic bridge.


Product Instructions

Saddle Routing Jig Instructions

The Saddle Routing Jig lets you slot a new bridge with a traditional single saddle or 2-piece compensated saddle, fill and move an existing saddle slot, widen a saddle slot for a compensated saddle, or flatten the bottom of the slot for a saddle transducer pickup.

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  • 4.73 average rating from 15 reviews
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Good but not perfect

(Customer's Reviews)

I have been using this jig many years now. The concept for the jig is great! The Dremel is not a great tool, to much play. Work best if you drill your way (by tilting the Dremel and drill a row of half "holes" with the router bit) in the middle of the slot and then use feeler gauges and the guide to route both sides of the slot, just kissing the wood.

Recently I found out that the acrylics in the jig was not as flat as they should be. I've been having some problems not getting the slot flat in the bottom. Flattened all the acrylics with my drum sander, the screws was easy to remove. I also noticed that the acrylic was not as stable as it should be. Even the weight of my small Dremel will bend the acrylic frame a bit. When using clamps and if the top of the guitar has an arc, the jig will follow the curve. And the bottom of the slot will follow to.

I have now reinforced the topmost frame with a steel sheet. I clamp it to the center and use thin slivers of wood to fill up the gaps between the guitar top and the underside of the jig before I do the routing. Now and only now the bottom of the slot is dead flat.

The shape an form of the jig is perfect, the material should be aluminum or some other metal instead of acrylic. That would be very nice!

I give my improved version of the jig and the method to use it five stars.


Makes a time-consuming job very fast...but

(Customer's Reviews)

I agree with Ben from Austin, don't use your Dremel - use your trim router. The jig comes with a pre-drilled base to fit the Bosch Colt and this is much more solid.

The problem with trying this job with the Precision Router Base and a Dremel is that the router base adjustment is a two-wheel affair that permits there to be the slightest tilt to one side or the other when adjusting the cut depth. This means your slot will be larger than the router bit and, even, worse, may end up with uneven ridges on the inside edge.

If you're stuck with having to use the Dremel. make sure the fixing screws on the router base are good and tight to minimize flexing.

Oh yes, and one other thing StewMac; can you improve the fit of the Dremel tool to the base? Some sort of locking system would make the whole thing more usable.


Great Jig, but not seamless with Precision Router Base.

(Customer's Reviews)

I think that both the Saddle Routing Jig and the Precision Router Base are very well made, and on a whole, are time savers. The rating I would give each individually would be five stars. The problem I have had comes when I use the Saddle Slotting Jig in conjunction with the Precision Router Jig to cut saddle slots. There is still enough wobble within the Dremel that the bits end up cutting a channel that is .018 oversized from the StewMac Carbide Downcut Bits (which are also a great part). This clearly means that if you use the 3/32 (.094) bit, you end up with a channel that is .112, and if you use the 1/8 (.125) bit, you end up with a channel that is .143 wide. I have talked to the folks at StewMac, who were very friendly, and they recommend I use my trim router, which I will do in the future. However, I disagree with StewMac's claim of the Saddle Slotting Jig working seamlessly with the Precision Router Base. Again, both are very well made, I have just found that they do not create an accurate slot width.

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StewMac PDF Catalog, page 33 See Saddle Routing Jig
on page 33 of our StewMac Catalog PDF

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