well i have an old bass and the bridge is awful, i have the action set to the bottom, I've lost a screw/spring so the only thing holding the saddle down is the string and all my string heights are different. How do I decide what bridge will fit and how to install it with strings fitted properly? I only really want to spend a max of 50 bucks. And I dont want another cheap crap bridge. So this is probably something I'm gonna have to order and do myself rather than have a tech do it.