The time has come, I want to beef up my MIM Fender Jazz V. Im thinking about upgrading the bridge, the pre-amp, and the control knobs. Ive been giving the J-Retro quite a bit of thought. That would take care of my pre-amp problems and my control knob problems. I looked through my back issues of BassPlayer magazine and they made it seem very confusing. Does anyone have any comments about it? What is the cost? Is it worth the money? Will this fit into my current bass with little problem, it already has a pre-amp in it but would this cavity work? How do you feel about the construction of it? Ive already been to: http://www.vintagebass.com/, http://home.freeuk.net/epro/main.htm, and http://pub41.ezboard.com/fthedudepitfrm2 and havent found answers to all of my questions. Are there other pre-amps that any of you think that I should look into? Im open for suggestions. Now for the bridge, I really havent done as much research for my bridge as my pre-amp. I want something in a chrome finish, that will increase sustain and punch. I dont want to dramatically effect the over all balance of my bass. If it gets a little more body heavy, thats ok with me though. I would greatly prefer a drop-in replacement. I really dont want to be drilling any unnecessary holes in my bass. Also, does anyone know the string spacing on the model of bass I have? I want the replacement to have the same string spacing as my current one. I know, It seems like a lot but any replies are greatly appreciated. Links to suggested product are also greatly appreciated.