I bought a new TRF heater motor, which I had installed in my TR6 when the tranny was out this spring. My original was seized. Since then, I've located two very nice complete heater assemblies on ebay, which I am preparing to disassemble and rebuild. I just ordered the new grommet packages from TRF and will take the cases to be powder coated when they're all apart.
The cores will go to a local shop to be cleaned and recored. The motors seems to be fine, but will go to my buddies at Yankee Auto Electric for disassembly and testing.
The resistor is the only item not available at this time. I may take a spare two speed switch along with the motor to see if they can find me a switch that will have the same style shaft, or interchange them, so that I can get a variable switch that does not rely on the resistor.
For the most part, Lucas electrical parts get a bad rap, but putting a resistor that is prone to failure inside a case that requires dash disassembly to remove is beyond dumb. Smith's heater engineers were sleeping when that design was approved.
I plan to do a pictorial for those who are planning to do the job. I will not be tearing he car apart at this time, but everyone will see what the heater case and cores are about.