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If you run a pair of 4 step pulleys, you can get almost as good variable speed as a variable speed motor. I really like the compression spring tension system on that grinder. Make sure you...

The No weld grinder from Tracy at USA Knifemakers looks like a good DIY grinder, and he has lots of extras available for it. I have bought contact wheels from him.

The Griz probably won't satisfy anyone working on razors - only one size contact wheel, and no variable speed, even with pulleys. All I know about the coote is in the above post. I'd want to know...