I just bought one at an auction. They found it in a large crock in the basement (where it had been forever). There is no rust but no belt either. Got belt and bobbins for it but the upper thread doesn't seem to go around the bobbin to make the stitch. Did they take it apart and not put it together again properly? I also found a fine spring sitting on the thread spool. There were attachments, needles and oil and grease in the box. Need help desperately, Thanks