We may have found other answers which could help you.
Click here for Needle Lower ThreadPresser foot level, needle and thread guide have fallen out?
Sew-tric ltd variable speed motor built 1982 6000rpm r007327?
Sewing machine starts on its own?
Sewing machine issue?
Toyota SL3404D Overlocker leaving big loops?
Singer zigzag 457 Stylist not threading bobbin/making stitch?