Built a slow speed grinder that has the same working principle as a AccuFinish grinder.
Also check out Dale Derrys slow speed grinder:
Part1: https://youtu.be/UvZ9Nby0RQ8
Part2: https://youtu.be/jZxb98UtK-Y
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https://www.patreon.com/stefangtwr
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http://gtwr.de/
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