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