That’s the thing though…..I think it’s a double action so you can’t take the nut out. If you could, piece of cake. That’s why I think your gonna have to go oversize and adjust. I like the gripper wrench….same idea. I’ve used the idea I’m suggesting by the by and it works well. 4mm or 1/8″ hex size is stupid. Don’t know why…

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If that nut comes out I’d pull it and replace it. I’ve had luck with a flat blade screw driver before. If that didn’t work, you could go with a reverse drill bit, reverse tap and then a reverse bolt. Chances are good that it would come out with just the drill bit. You might also just try popping an easy out in there.

Just passing along a suggestion. Good luck on your project.

I am not one of the Rich looths

I was thinking about making a custom wrench. will probly give this a go. Maybe even give a slight hollow grind to each surface so those corners BITE

https://www.stewmac.com/luthier-tools-and-supplies/tools-by-job/tools-for-truss-rods/gripper-truss-rod-wrenches/?queryid=4e60bd912bb5e323b18e0e6fe2de063f

So I think those are double action trusses? If so, I’d take a 5/32″ hex wrench, cut the 90 degree end of so it’s straight, slightly bevel one end, and hammer it in and adjust. 5/32 is a hair bigger than 4mm. You can back it out by putting a pair of vice grips on the end of the rod and hammering on the vice grips to back it out.

Some people have painted over faux wood. It would certainly be acceptable on this instrument to give that a whirl. We did an episode with joe glaser on the subject. Nikki Walters did a fine article on the subject as well.

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Thanks Ian – I take it you don’t think epoxy and splines will hold? Is there anything that can be done to cover carbon fiber or is it just visually apparent?