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Discussion in 'Hardware, Setup & Repair [BG]' started by karatewolf, Apr 13, 2009.
What size allen wrench do I need for adjusting the truss rod?
What kind of bass?
It's a Fender P-Bass.
You may just need to get a set of them and try a bunch until you find the right one.
It depends on where and possibly when it was made. The '80s MIJ ones use a 5mm one, but the US "bullet nut" used on Jazzes and Telecaster basses in the '70s used a similar but not the same sized SAE wrench.
Smartest way to find out is to buy yourself a set of good ones in both metric and SAE sizes, and try them until you find the right size. They're useful for a lot of stuff so I've never regretted buying any allen keys. Quick way might be to go to FMIC's "Mr. Gearhead" and find the stuff for your particular bass.