We may have found other answers which could help you.
Click here for Model Sewing Hand WheelStuck Feed dog?
Bernina Update 1630 work light not working?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
Sewing machine issue?
Sew-tric ltd variable speed motor built 1982 6000rpm r007327?
How do fill a bobber?