Bob: The rail could be bent and the bushings could be worn, but the most common problem I have found is either loose screws on the hanger brackets, or the hangers themselves out of alignment. Tightening the bracket screws and straightening the hangers will frequently cure the problem. It's also a good idea to lubricate the bushings or replace them. Patrick Poulson, RPT
This PTG archive page provided courtesy of Moy Piano Service, LLC