I have a fretless MIM Jazz bass which I like very much. I changed the pickups and shielded the cavity pretty much the day I got it. (a few years ago) Now I am thinking about swapping out the tuners. I feel they don't hold the tuning very well. I haven't changed the strings in a few years either and don't intend to. I don't really want a lot of sustain, naturally. I like the thud it has, and when I want to make it sing, I can just work it a little. Maybe a little more would be OK. Furthermore, this is a cheap bass and I don't want to spend terribly much on it. The neck balance is fine, and I'm scared to mess with that as far as the weight of the tuners. SO, what are some not overly expensive tuners that work well, that are about the same weight or just a tad bit heavier than the stock 2000 MIM Fender Jazz ones? Also, this seems like the sort of thing it wouldn't be hard to do myself. Is that true?