Deep cutting end mill.
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Previously:
https://www.homemadetools.net/forum/...960#post224136
https://www.homemadetools.net/forum/...034#post199068
https://www.homemadetools.net/forum/...817#post124493
https://www.homemadetools.net/forum/...740#post182989
https://www.homemadetools.net/forum/...6606#post83998
