Knife edge center finder.
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Previously:
https://www.homemadetools.net/forum/...487#post193015
https://www.homemadetools.net/forum/...983#post164453
https://www.homemadetools.net/forum/...236#post188344
https://www.homemadetools.net/forum/...353#post185200
https://www.homemadetools.net/forum/...148#post184467
