Product review (3 stars): you are better off doing a full overhaul - hot and cold ...
If you find that you need to replace the washers in your Temptrol, you are better off doing a full overhaul - hot and cold seats and installing a new spindle. I found when I tried to just replace the washers, I could not remove either one of them (larger one was under a ring that needed to be cut to get off and the smaller one was fused to the spindle) from the spindle and the seats were also very worn. The washers are included in a new spindle, so go for that instead.