 
                We may have found other answers which could help you.
Click here for Grinding Noise Looked 
                Bobbin won't wind?
 
                Singer zigzag 457 Stylist not threading bobbin/making stitch?
 
                the thread is bunching on underside of fabric it looks like birdnest?
 
                Need a service manual for a Singer Treadle Sewing Machine Model 66-1?
 
                Presser foot is loose?
 
                Singer 507?