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Yes, I repurposed a basic grinder for use with 4" wheels and I added extensions to the spindles. There is probably a product designed for that buffer.

A lot of great advice here. I can add the warning to not work a full hollow ground blade on power tools. It can thin the blade to uselessness or remove metal off the edge horribly fast. One misstep...

I don't think a stone grinder is of any use for razors. The belt and flat wheel type are what most people use. Even those that make blades from scratch still use a belt for grinding.