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I used chromium oxide in grease.
They usually sell it in hardware stores in the shape of small bricks. Costs 10$ for a brick. The grit size of mine is around 15 micrometer.

You hold the brick...

Be very, VERY careful with putting a buffer wheel in a drill press to polish razors (blades or scales).
Several people here have had nasty accidents or almost-accidents with buffer wheels. Buffer...