Hello Jenny,
Undo the scew in the stop motion, turn the stop motion wheel so it is fairly tight then stighten the screw again, if you cannopt loosen the stop motion after that then undo the screw and undo the stop motion wheel all the way off, you will have a three pronged washer, just put the washer in a different position, screw the stop motion wheel back up finger tight thenh tighten the screw.
Ken
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