[codefox1]

Agree with all. Now, Philco sets probably didn't have switches plated in silver or gold, some equipment did. That's why the very conservative methods were used in the past. If we're dealing with copper contacts encrusted with mouse pee that have lost their tension and sticky shafts, or busted bakelite that needs to be clamped and crazy glued together that's one thing. Switch contacts, just as tube socket parts are sometimes possible to be replaced by donor parts from junkers, but this often involves rather delicate operations to clear the offending area, remove he existing piece, and replace it, and finally epoxy it in place and wait a day or two while it sets up and cures. And eventhen the operation may be successful but the patient dies, but that's how it is.