Grinding rack teeth.
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Previously:
https://www.homemadetools.net/forum/...599#post228769
https://www.homemadetools.net/forum/...785#post220365
https://www.homemadetools.net/forum/...458#post162192
https://www.homemadetools.net/forum/...011#post184017
https://www.homemadetools.net/forum/...647#post186150
