Hi, I have a MIM Jazz bass, ash body (4 piece) with clear, natural finish. I recently added two lindy Fralin PUPs, which sound great. After reading posts about the insignificance of nut or bridge changes to the tone, I am wondering what other changes I can make that will seriously improve the tone even further. New tuners? Do they effect the tone at all? How about a new neck from warmoth or other replacement companies? I wish to keep my bass passive, so I don't want to go active at all... Is this 4 piece body and somewhat less then perfect neck going to ruin my tone? Are there room for improvements? I am not neccesarily addicted to the vintage tone, although I like it enough to have put Fralins on.