I dont have a heater on my sizer cause i generally use a softer lube and do this work in the summer . I needed to lube some bullets the other day and was having to use a lot of pressure cause my room was only about 60 degrees. Then i thought about the magnetic heater i had in my garage. I attached it to the sizer, plugged it in and let it warm up and it worked pretty good. Since i only used it for about ten minutes i cant say if it would have eventually gotten too hot but im gonna mount a metal plate to the base of the sizer, large enough to move the heater further from the sizer to regulate heat if necessary. Anyone tried this?