The correct gauge files are chosen and when the the slot is at the correct depth, each file will rest flat on arched form of the jig. This is a common problem and an old bridge can be fixed in minutes.

Overview
I found this problem in many guitars left in for set-up. Before I would use the Stewmac understring radius gauge to determine the extent of the problem. Then I would detune one string at a time, file a bit, retune and repeat until the strings were at the right depth. The problem with this method was the guess-work. Sometimes several checks would need to be made before the string was in the right place. The new jig makes a 20 minute job into a 5 minute job and is very accurate.

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The bridge from this guitar is old and heavily distorted. The bottom of the string slots form an arc which should line up with the fingerboard radius. If this arc is flattened due to distortion in the metal, the strings in the centre will be too near the fingerboard and cause serious fretbuzz.

This straight-forward jig alows you to visually inspect the arc and compare it to the optimum 13" radius. The thumbwheels allow you to line it up slowly and decide how much material should be removed for bass and treble sides. The springs stop the thumbwheels slipping during the re-shaping process.

Bridge Jig