Free to borrow. Members can message the owner to request it.
For adjusting the truss rod/neck relief after frets have been installed. Notches spaced for standard 34" scale length (Fender Precision/Jazz Bass, etc.). To save a few bucks I marked up a heavy aluminum T-square from Harbor Freight with a Sharpie and then attacked it with an angle grinder and sandpaper flap disk.
Lives at Casa Del Gamp
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