Short turn, yes, not slow.
Early last year Daverupa quotes : "One will also notice that certain passages are not found elsewhere in the Pāli—for example, the simile where a yogi sensing each breathflow’s length is compared to a turner who knows the duration of each pass [of the blade?] on the lathe."
This is still the only way I can make sense of the lathe image, so is this possible based on the pali? Is there still uncertainty about it's meaning? Virgo says potter's wheel!
This won't worry or hold me back too long; it's just the burning question of the day.