Jack, I feel I should take the advice about the wire brush just a step farther. I used a .30 Caliber brass rifle bore cleaning brush (you Sceni-guys may need a larger caliber) on a cleaning rod and virtually burnished both tracks before attempting the replacement.KY Jelly? Hmm, that's pretty sophisticated. Plain old dish soap works just as well...but then I've never found a need for that other stuff. Bob