While you wait for answers, we may have found some information which could help you.
Click here for Service Thing Apart HelpPresser foot level, needle and thread guide have fallen out?
Toyota SL3404D Overlocker leaving big loops?
How can I mend my Frister & Rossmann sewing machine?
How to switch on light of sewing machine?
Singer zigzag 457 Stylist not threading bobbin/making stitch?
How do fill a bobber?