Thanks for the info Denny.
I know what you mean about the cost of switchs. When I first bought my '53 I thought they were to expensive for NOS switches. A few years later when I got serious about buying a spare, the prices had doubled if not more.
I either use the heater or don't, so it's never used on low. Either high to defog the windows or it's summer time and doesn't matter!
Jeff