Clamping squares.
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Previously:
https://www.homemadetools.net/forum/...737#post193943
https://www.homemadetools.net/forum/...277#post184998
https://www.homemadetools.net/forum/...050#post172018
https://www.homemadetools.net/forum/...781#post148216
https://www.homemadetools.net/forum/...109#post230347
