We may have found other answers which could help you.
Click here for Adjust Timing Singer
                Singer 507?
                My CG 500/550 Singer Sewing Machine's bobbin isn't working?
                What size needles can I use for my Singer 39a3?
                Engine revving up ?
                Presser foot is loose?
                Singer zigzag 457 Stylist not threading bobbin/making stitch?