I must agree with Slowhand. I've talked to Harry, Sheila, and Mike many times, and they always were interested in my question, and provided help that always worked. When I first got the rim drive, the arm shook, and dipped = always stayed in the groove, but it looked awful. Harry said that the ring around the rim drive had to seat...it would take 2 days, and damned it - in 2 days, the arm was and is quiet...doesn't even look like its moving. One of quite a few issues, but always resolved.