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I use a wooden rod with paper wrapped around the rod end. Secure the paper with tape or saw a slot . I put lapping compound on the paper and push the pull the rod. I use a variable speed drill for low rpm's and turn direction to keep the paper tight. I used diamond paste 9 micron. Crocus cloth will work as well. You aren't trying to remove stock. Just enough to get the corrosion off and make the metal bright. This is nothing like fire lapping.
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