By how deep he set the metal slug into the body?
(clunk, Mon 11 Sep 2017, 23:48,
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That was one part of it
but he was making marks on the spinning shaft to note roughly the imbalance, but then somehow he was tuning it more finely. I suppose it boils down to skill and experience.
(Varmint, Tue 12 Sep 2017, 9:44,
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