While you wait for answers, we may have found some information which could help you.
Click here for Sewing Machine Pedal WorkingThe thread loops under the fa?
How do fill a bobber?
How can I mend my Frister & Rossmann sewing machine?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
Toyota SL3404D Overlocker leaving big loops?
Frister & Rossmann cub 7?