Hello, On the swallow parker copy bass I'm building, I want to put a wooden bridge, but I want means of adjusting height (intonation will be fixed). I remember seeing some kind of thumbwheel adjustment screw, something that had an adjustment screw and threaded part on both sides of the thumbwheel. Can't remember where I'd seen those and I'm not sure if they will work, I think the threaded part is fixed into the body and the bridge rests in the thumbwheel which is heightened or lowered while you turn it. Anybody remember these? or has any other options that I might consider? Thanks..