We may have found other answers which could help you.
Click here for Machine Quit WorkingHow can I mend my Frister & Rossmann sewing machine?
Frister & Rossmann cub 7?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
Sewing machine issue?
Presser foot level, needle and thread guide have fallen out?
Toyota SL3404D Overlocker leaving big loops?