10th on a widelux FV

Can anyone tell me how the 1st cog-wheel of the 1/10th is supposed to
work on a widelux FV camera? It looks like only the small cog wheel is
supposed to turn (counter clockwise) when transporting the film, but
when the shutter is released it somehow "grabs" the washer with the odd
shaped hole which turns the bigger cog wheel as well (clockwise) and
sets the whole set of wheels to turn. It looks like mine doesn't grab
the main wheel that turns all the others, including the one with the
weights, so there's no delay of the shutterspeed and no difference with
the 250th...