We may have found other answers which could help you.
Click here for Machine Model HotPresser foot is loose?
Singer 201 went bang , smelt and now won’t work?
Need a service manual for a Singer Treadle Sewing Machine Model 66-1?
the thread is bunching on underside of fabric it looks like birdnest?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
My CG 500/550 Singer Sewing Machine's bobbin isn't working?