DUPLO Early Simple Machines missing parts

[Philippe Hurbain]

About the crank handle... the base of the axle looks like it has some sort of twist lock pattern. Any idea of what might fit there?

Could you PM me your gmail e-mail. I would share with you files, where I make measurements...
If possible, of course...

My address is relativity public: philo _ at_ philohome dot com
Not yet on PT, but gear 24 is done....