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Aye, I prefer the pencil marks too. Draw them, lap until gone, draw and lap again to check, then the entire grid should disappear in just a few strokes. And don't be too scared of a not perfectly...

Ah, but if there's just not enough water between the stones, they'll stick together mightily and it will be quite a hassle to let them come apart. I even had that when raising a slurry on a Jnat with...