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Lapping on lapidary grit on a thick and level glass plate is an order of magnitude quicker than using a small diamond plate in my experience - just think of the increase in area of a 2ft x 2ft bit of...

I don't think you are missing out any! For the life of me, from a honing point of view, I cannot see any point in having one - other than for the sake of having one, if you get my drift...
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