I have a Fender HWY 1 Jazz (the old one) for about one year right now. Since I have it, i set it up for about 5-6 times. I had buzz on the last frets, and decided to straighten the neck more. The relief at the 8th fret was about the thickness of a credit card, and I decided to make it smaller. I turned my truss-rod a quarter turn, everything worked great, but within 2-3 weeks my neck started to bend back to it's initial relief, and STOPPED THERE. I did it again, and the same problem... Any advice? Can the truss-rod be broken? It works very fine, I don't have to put up effort, and it has effect on the relief, just it goes back... Is it just because the wood is not dryed out completly and because the bass is relative new? What should I do? Thanks a lot, and excuse my english.