I got a rough idea of how he marked the spindle to find the off-balance, but couldn't work out how he then fine tuned it.
(, Mon 11 Sep 2017, 23:36, Reply)
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.
(, Tue 12 Sep 2017, 9:44, Reply)