heater resistor

i see that @ToyotaMatt has refurbished some of these switches and wonder if anyone knows a thread that would guide me through the process? or is this only something electrical gurus should attempt? i have pulled the switch and can confirm my heater resistor is not the problem. the switch...

These are for Later style heaters on the FJ40, but can be modified to fit earlier ones. This is what gives you low and high speed. Resistors are for 12 Volt systems. I have a few of these I am willing to let go for $40 plus shipping each until they are gone. I also have an extension cable...