headlight switch?

I have access to some bone cars, 63 bel, 66 coronet, 64"/? val. I sprayed rust penetrant ( not sure it has any way to get into the switch), taped it pretty good with hammer, the knob will turn, but can't get it to budge, the release button works normal. the way the surround bezel is made really can't get a cut off wheel to it! LOL
yes I guess moisture got to it. I never had a headlight switch froze like this....