I recently bought a used '91 Fretless Jazz bass and am fairly happy with it, except the tuners are causing some concern. They seem to be fine when under tension, but when I was changing the strings I noticed they're fairly loose and wobble a fair amount back and forth. Am I right to be worried and should I look into replacing them? If so any recommendations for replacements would be nice. Preferably not ultralites cause I don't dig the look.