You all are correct. Its the electrical switch. Using a flat blade screw driver and ensuring to press the little button in all the way, is very catchy and sometimes will not turn at all. I bought this switch only a year ago. The original was working but often had to jiggle it to get good contact. Not bad for a 42 year old switch.

The mechanical lock by it self works good but feels like it could use some lubricate.

I'm really resistant to buying another electrical switch. I absolutely hate how difficult it is to change them, and how often is that going to be? The alternative would be a couple of separate switches capable of connecting 14 GA wires.

Thanks Art, I reviewed your site on removing the key switch. I'm glad I didn't go that way unnecessarily.