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Now you have me wondering... just how much would a machine shop charge to surface grind these hones? I have quite a few that need lapping and if the price were right, like $5 each or less, I would...

6,000 ???? Did you add an extra zero?

The quickest method is to use a diamond hone, but that hone is expensive. The least expensive is to use sandpaper, but that takes a long time.