We may have found other answers which could help you.
Success
Message
the thread is bunching on underside of fabric it looks like birdnest?
Presser foot is loose?
Singer 201 went bang , smelt and now won’t work?
Bobbin won't wind?
My CG 500/550 Singer Sewing Machine's bobbin isn't working?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
Singer 507?
1965 Singer 275k sewing machine foot pedal?
Engine revving up ?
how to get the tension right on my machine?
What size needles can I use for my Singer 39a3?
Need a service manual for a Singer Treadle Sewing Machine Model 66-1?