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How do I flatten my water stone?

A water stone wears unevenly and becomes dished in the middle over time. That makes it hard to get a straight edge, so the stone needs flattening regularly, ideally every time you have sharpened for a while.

The easiest way is to rub the surface of the stone against a coarse diamond stone under running water until it is flat. Draw a pencil grid on the stone first, so you can see when it has all been removed. You can also use the diamond stone to sharpen tools when you need a coarser grit than 300.

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