We may have found other answers which could help you.
Click here for Bobbin Problem Singer
Engine revving up ?
Need a service manual for a Singer Treadle Sewing Machine Model 66-1?
Bobbin won't wind?
Presser foot is loose?
Singer 201 went bang , smelt and now won’t work?
Singer zigzag 457 Stylist not threading bobbin/making stitch?