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I don't want to discourage you from learning in a safe way to use power tools to restore razors.

I do use a Dremel to help with cleaning out pitting, and other tasks. I just practiced on things...

Absolute minimums. Initial clean up/evaluation and final polish: Newspaper with Mothers Mag and Aluminum polish.
Satin to Mirror finish: 800 - 2k wet and dry sandpaper.
Pitting removal to Satin...