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Tulip: I glue leather to the tile, load the leather with the abrasive (0.5 micron chromium oxide in my case) and that's what cuts the metal. You want the tile backing the leather to be perfectly flat...

You may wish to make a bench-hone instead. I used a piece of machine-flattened marble tile. A new marble or granite tile costs $5. Having access to a tile-cutter may be an issue. After that I just...