Hello Bonnie,
Undo the screw in the balance wheel, unscrew the big stop motion and take it off completely, there will be a large 3 pronged washer, make sure the washer is completely sitting in the grooves, screw the stop motion back on as far as it will go, put the small screw back in and test the stop motion to see if it will disengage to wind the bobbin, any problems you can e-mail me if you wish, drivewithken@blueyonder.co.uk
Ken
Ken Dourof, April 2007