We had to use the spark plug type probes for CHT on our O-200. I've looked everywhere and cannot find any information on installing these other than do not use a crush washer.

Is there anything to be done each time a spark plug is removed? I usually throw away the crush washer and install a new one, can't do that with $50 probes. Are these made out of some special material that can be reused over and over again? If so then why aren't the spark plug washers made of the same stuff?