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                My CG 500/550 Singer Sewing Machine's bobbin isn't working?
 
                Bobbin won't wind?
 
                Presser foot is loose?
 
                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?
 
                Engine revving up ?