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I'm sure some were coticules I believe, which opens up the variation even more. But then again I've heard chinese 12k's to be extremely varied in performance for a single stone

what type of 12k is it? naniwas are pretty quick finishers (10 laps) whereas chinese 12k generally slow (30 laps), it depends.

Whatever stone it is, I would advise, very slow perfect strokes....