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Just to illustrate what I mean, when I see this:

267886

Then I know it's time to break out the plate and lap it. I can't recall what I did to reveal that, probably using it to burnish a natural...

This is pretty much my approach to it with any stone.

With respect to Synthetic stones, Gssixgun already hit it. Lapping I've done once on my Norton and Shapton Kuromaku stones. I think my Norton...