Hi, I have a Fender Stu Hamm Urge II, with the truss rod adjustment down by the body, not at the headstock. I've stripped the dang nut on the truss rod. Looking around, I see a common theme with Fender truss rod nuts. Looking here: http://www.guitarpartsresource.com/bass_trussnuts.htm I am guessing it would be the genuine Fender American Std nut. But how can I be sure without pulling the nut off first? It still works some and I'd rather leave it in if I can. But I certainly need a replacement. It's a 3/16 for sure. The adjusting t-handle ball end wrench that came with it is that size.