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How To Flatten A Waterstone Ready For Tool Sharpening

A ceramic flattening stone rubbing a waterstone over a bowl of water.

Step 1

Place a rule along your waterstone to show any hollowing.

Steel rule across a waterstone showing a hollow in the centre


Step 2

Using a pencil scribble on the face of the stone. This will give you a clear visual guide of how flat your stone is becoming.

A scribbled pencil line along the waterstone


A ceramic flattening stone rubbing a waterstone over a bowl of water.

Step 3

Using a ceramic flattening stone run along the face of the waterstone. Dipping in water rinses away residue.


Step 4

Cutting away the high points leaves only the pencil markings where there are still hollows.

Ceramic flattening stone next to japanese waterstone with pencil line.


Worn pencil line on Japanese waterstone.

Step 5

It's important to keep checking the flatness of the stone throughout the process.

Step 6

Continue until the pencil lines have disappeared.


Step 7

Check for final flatness.

Steel rule on Japanese waterstone showing stone completely flat.

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