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I am not sure about aluminum, I use stainless steel plate on top of the magnets and have never had heating problems while sanding, and Imean not temperature change whatsoever. If your aluminum plate...

Variable speed rotary tool is very much usable for resto work if you know how to use properly and are skilled with your hands.
Foredom sells 500rpm-20-25k rpm tools, but you can get a Chinese knock...