[Arran]

I think that the O.P was looking at how to replace a worn down phenolic piece that actuates the switch, not the switch itself. Given that you would have to take the assembly out to replace it, even to replace it with another assembly, I can't see the harm in making a replacement of the worn part and trying it, I'm curious as to what it looked like, the only 1942 model Philco I have is a 42-327, and the P.B assembly is different in those, I think.
Regards
Arran