Jon
I was just messing with the headlight switch from my '51. It's different than the ones you've been working on, in that the slider is a metal box, no bakelite, and the rod doesn't release from the switch at all, but the knob screws off and has a setscrew. Maybe it's an early replacement style.
I got a 12V repop for cheap and it's the same, except has a 20A circuit breaker instead of the 30A one on the original switch. Also the pot for the dash lights has a different resistance. What I was able to do was disassemble both switches and swap the pot (the slider on the 6V switch was broken off and making the rod bind up) and the circuit breaker. I now have a serviceable 6V switch to use. Here's a pic of the parts I have leftover after converting the 12V repop switch to 6V.
