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Jaap suggested the stocker might have a freewheel, but apparently that makes the whole thing even more complicated
Both riders on a da Vinci have a freewheel. IIRC, there have been designs without the jackshaft which provide only the stoker with independent freewheeling, i.e. if the stoker turns the cranks, the captain's cranks must turn too, but not vice versa
gbj_tester
It's interesting though. @Jaap suggested the stoker might have a freewheel, but apparently that makes the whole thing even more complicated:
E.g.