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Now THAT I wasn't aware of. Thanks. I suppose cleaning them that often (a few strokes every 4 or 5 uses) with a DC8 would pretty much keep them flat as well right?

The pointer to Howard's post was a good answer. Use a precision straight edge and look for light. Apparently a $3 ruler has enough precision for the job. Good enough. Thanks Viktor.

I guess that...

How do you know your hone needs lapped without lapping it? I understand the trick with the pencil pattern when lapping a stone. Let's say I buy a stone pre-lapped and I use it for a while. How can I...