I purchased a modulus flea from ebay. I believe it is a 96 from the serial #. The bass sounds unbelievable and looks great. My problem is 2 things. I have buzzes here and there, mostly on sustained notes. There is no truss rod for adjustment and the neck is as straight as it gets. Doesn't seem to need fret work either. The other problem is the neck is 1.75 at the nut (5 string width I believe and this is a 4 string). My question is can I replace the neck with a new neck that has a smaller width than the original? Also would the bridge have to be changed? Any info would be helpful at this point. Got the bass for a pretty good price so if I have to dump some more into it, it wouldn't be that much of a problem.