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Ditto what jr said about opening it. Before trying that, try squirting control cleaner inside the switch and working the shaft. Sometimes the old grease gets solid and won't let it operate. Electronics cleaner as sold at auto parts stores would be what I'd try. If no obvious place to squirt, drill a tiny hole in the side of the case.
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Reece
Perfection is hard to reach with a screwdriver.
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