Round carbide insert.
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Previously:
https://www.homemadetools.net/forum/...419#post224859
https://www.homemadetools.net/forum/...837#post223743
https://www.homemadetools.net/forum/...123#post210956
https://www.homemadetools.net/forum/...860#post206641
https://www.homemadetools.net/forum/...793#post223623

