Dual milling.
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Previously:
https://www.homemadetools.net/forum/...037#post176139
https://www.homemadetools.net/forum/...722#post178655
https://www.homemadetools.net/forum/...6606#post83998
https://www.homemadetools.net/forum/...6406#post83605
https://www.homemadetools.net/forum/...466#post166346
