Honing cylinder walls.
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Previously:
https://www.homemadetools.net/forum/...041#post226943
https://www.homemadetools.net/forum/...964#post229915
https://www.homemadetools.net/forum/...038#post230127
https://www.homemadetools.net/forum/...260#post230781
https://www.homemadetools.net/forum/...629#post189889
