I've had a 1994 Fender MB-5 (Japan) since I got it new. It was stolen in 2013 (I posted about that here), and I recovered it from a local Guitar Center. Whoever had it while it was gone chewed up the truss rod nut pretty bad and also over tightened it. There are no threads left on the rod to tighten it anymore. I can't find a washer that will fit in there. The regular Fender ones for vintage Fender instruments don't fit even after a lot of filing the inner and outer parts. Now, here are my questions that even Fender could not answer. What thread size is the truss rod??? Is it metric? It's a tad bigger than a normal Fender rod. The hex key adjustment is metric on the stock truss rod nut (well it is now anyway after being chewed up. Can't remember if it was before). I want to (and need to) find a truss rod nut that will fit it, and also get some more room for adjustment (which means washers that actually fit underneath a new nut, or a new nut that is longer that I can take the first 3 rounds of threads out of with a drill, and then tap it for clean threads). Anyone have any insight, or ideas on the best thing to do? I'm just blown away that Fender has no records on this model of bass! I e-mailed them, and they didn't even have part numbers for anything other than the truss rod wrench that would be used! Any help with this would be greatly appreciated!