Hello Lacey,
All that has happened is the stop motion has moved inside the balance wheel, undo the screw on the stop motion wheel, unscrew the stop motion all the way off, take the three pronged washer off and put it in a different position, you can turn it upside down if you wish, screw the stop motion wheel back on finger tight, tighten up the screw in the stop motion wheel and test, if it still slips take the stop motion wheel off and position the washer a different way.
Ken
drivewithken@blueyonder.co.uk, January 2009