To accurately center biscuits on the thickness of your workpieces, use a rule instead of the joiner’s built-in scale.

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Biscuits

To accurately center biscuits on the thickness of your workpieces, use a rule instead of the joiner's built-in scale. First unplug the tool. Place your ruler against the biscuit-joiner fence and center the blade mark at half the part's thickness. For example, center the blade 38 " from the fence for 34 "-thick parts.
—from the WOOD® shop