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The 1k is for checking the stone,or polishing the stone, not final flattening. The Woodcraft stones are often cut pretty nicely, and there's always the chance it will be flat when you get it. Slim...

Draw a pencil grid on ONE side, use a permanent marker to draw an arrow "up" on the side of the stone, Rub in circles on a piece of 1000 grit wet/dry sandpaper -- check after 8-10 circles -- is grid...