 
                 
                Presser foot is loose?
 
                Engine revving up ?
 
                the thread is bunching on underside of fabric it looks like birdnest?
 
                Singer 188K1 presser bar stuck?
 
                What size needles can I use for my Singer 39a3?
 
                Singer zigzag 457 Stylist not threading bobbin/making stitch?
