 
                 
                Bobbin won't wind?
 
                the thread is bunching on underside of fabric it looks like birdnest?
 
                Singer zigzag 457 Stylist not threading bobbin/making stitch?
 
                Presser foot is loose?
 
                1965 Singer 275k sewing machine foot pedal?
 
                My CG 500/550 Singer Sewing Machine's bobbin isn't working?