We may have found other answers which could help you.
Click here for Fly Wheel Not TurningSinger zigzag 457 Stylist not threading bobbin/making stitch?
Parts spares?
Presser foot level, needle and thread guide have fallen out?
Sew-tric ltd variable speed motor built 1982 6000rpm r007327?
How do fill a bobber?
Toyota SL3404D Overlocker leaving big loops?