Hypoid gear.
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Previously:
https://www.homemadetools.net/forum/...290#post208174
https://www.homemadetools.net/forum/...385#post142510
https://www.homemadetools.net/forum/...494#post170015
https://www.homemadetools.net/forum/...332#post165846
https://www.homemadetools.net/forum/...827#post183357
