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A way to check flatness of a Diamond Hone ( or any other) is to set it on a nice marble counter-top and see if it wiggles corner to corner or end to end. Change the direction of it a few times and...

DMT must have improved over the last couple years. Mine were not flat. I contacted them and got no reply. I tried again with the same results. The Trend was also not flat.
Been a machinist most of...