Saw blade teeth grinder.
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Previously:
https://www.homemadetools.net/forum/...408#post208620
https://www.homemadetools.net/forum/...226#post191988
https://www.homemadetools.net/forum/...811#post190611
https://www.homemadetools.net/forum/...780#post183113
https://www.homemadetools.net/forum/...276#post181030