The allen wrench cannot seat fully into the nut. A top brace is right up next to it and partially blocking it. Using a mirror, I'd estimate that the upper 25-30% of the truss-rod nut is inaccessible.
Any suggestions? Should I shave down a little of the brace just in front of the nut? Would a ball-end wrench get under there?
I've had no trouble at all adjusting my Gitane DG-300. It was a cinch. This GJ-10 was purchased used and plays and sounds great. However, it has just a little more relief than I like.
Thanks for any help.