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Yeah, OK.

I do not use it, but understand the grid.
I do not need Josh's tutorial but thank you all the same.:p :D

The OP said he did not know if his stone was flat, and had no more...

circular movements may not be the best for lapping:shrug:

If you want to check your stone you could rub some pencil over your sub-plate. Rub the stone over that to reveal any high spots