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Or rub the shaft of a screwdriver up and down it 8-10 times. Just knocks off any big protruding diamond pieces.

i just got it at my neighborhood Ace hardware.

Do you clean it after or before use? I scrub mine with a bathroom scrub-brush after each honing session to make sure I get all the stone detritus off of it. I use it to lap each stone (lightly)...