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OK, ixnay on the pavement. Before I had the DMT I'd just lap my hones against one another, starting with the coarsest one against the cinder block bove my basement sink. There's one very flat spot of...

Good selection! Draw a grid in pencil, no more than 1" squares, on each honing surface then lap it away under running water. The DMT plate will want to stick to your hones, that's normal.

Since...

Yes, leather as natural as you can find it. Avoid leather from fabric stores, as it's probably been treated with something to make it more suitable for upholstery. Something plasticky or waxy.
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