I traded for a WW9 and thought it had a problem. I tried to sew with it and it would not pick up the bobbin thread. I had a manual for it I had bought off line and decided to look and see if I could find out the problem, well I did, lol....it runs backward. I would have never figured this out. I would have probably just let it sit. It sews great now. It is very old and in pretty good shape. I had never heard of a sewing machine running backward, lol.