While you wait for answers, we may have found some information which could help you.
Click here for Singer Stylist Feed
Singer zigzag 457 Stylist not threading bobbin/making stitch?
Bobbin won't wind?
Presser foot is loose?
What size needles can I use for my Singer 39a3?
Engine revving up ?
1965 Singer 275k sewing machine foot pedal?