Sorry up front for the long post. I have a 92 MIM Jazz that I picked up for $250. I had some parts laying around so I put a BAII bridge, DM model J PUs, and an Audere JZ3 on it. It was a great player for about 3 years. I noticed the truss rod was bottomed out after I got it home, but the relief was okay. Anyway, I recently took it out and the relief was too much for me. Buzzing above the 12th fret that I could get out by raising the action but it wasn't close to what I'm used to. I removed the TR nut and put a single washer on it. The TR nut bottomed out and it didn't help the relief any. I "assisted" by pressing on the headstock and removed the string tension to no avail. With no tension, the neck had a lot of relief with the TR nut bottomed out!! I then changed the strings out to the lightest tension I could find, D'Addario XL Super Lights. That didn't help much so I put another washer in and tried again. This time, the TR nut started to tightened and then "let go". I removed it and noticed that the threads didn't look too good, I chased them out with a 10/32 tap and tried again but it wouldn't hold. I removed the washers and the nut tightened up, but the neck was still bowed. I decided to drop $5 on a new TR nut from Bass Parts Resource. It came in and did the same exact thing!! At this point, I wonder if the TR rod threads are shot. If so, is the next step a replacement neck off of evil bay? There's about 30 of them listed and seem to go loaded with tuners for about $150. Wouldn't the repair bill go for that much or more? What to do?? It's a good bass that i don't want to consign to the parts bin!