We may have found other answers which could help you.
Click here for Singer Gear Modelhow to get the tension right on my machine?
Presser foot is loose?
1965 Singer 275k sewing machine foot pedal?
the thread is bunching on underside of fabric it looks like birdnest?
Singer 201 went bang , smelt and now won’t work?
Need a service manual for a Singer Treadle Sewing Machine Model 66-1?