Hi there, I'm doing up a Yamaha RBX-260 and am looking for a bridge for it. The saddles don't have "tracks" and seem so have a fair bit of movement in them, leading to potentially uneven string spacing. The three I'm considering are: Allparts Adjustable: http://www.realparts.com.au/bridges-tailpieces/bass/adjustable-4-string-bass-bridge-chrome.html Wilkinson: http://www.realparts.com.au/bridges-tailpieces/bass/wilkinson-4-string-bass-guitar-bridge.html Generic? Gotoh style: http://www.realparts.com.au/bridges-tailpieces/bass/4-string-bass-bridge-chrome-3173.html A couple of questions: How useful is the "adjustable" feature? How are they adjusted? The Wilkinson doesn't seem to have tracks either... Is this ok? What's the deal with the generic one? Thanks!