The only thing I've ever heard was a guy talking about how he cut one fold out of the worn bellows from the right side and re-glued the bellows back on. He swears that stiffened the bellows up slightly but I'm not so sure I believe him.
Jim, guess you havent been to Angelle's lately. There's a lot of phillies that got the clap and are floppy but they get down just as good as the rest ! Lol