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If you can get them (it) to work when the switch is jiggled occasionally... you may be able to service the contacts in the switch... which, over the years, can become bent and corroded... preventing proper opperation.
The end of the switch can be pryed off (be careful to note the orientation and order of the componants- there are a few pieces of plastic, springs... in there)
When I did mine the small amount of corrosion had led to the contacts dragging and bending out of position just enough to cause failure.
Careful manipulation and a little trial and error, coupled with a cleaning and a coat of dielectric grease - got the switch to work properly again.
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