We may have found other answers which could help you.
Click here for Stitch Adjust Machine
Presser foot is loose?
Singer 507?
the thread is bunching on underside of fabric it looks like birdnest?
Singer 201 went bang , smelt and now won’t work?
What size needles can I use for my Singer 39a3?
My CG 500/550 Singer Sewing Machine's bobbin isn't working?