OK that was for be sure! :)
In any case very cool result!
I will try is with the MS Physics by Anton inside SketchUp
(here nothing to do with gears just for see the "apparent" easy use :)
with gears! ;)

Here tutorials about MS Physics with gears...
https://www.youtube.com/watch?v=Vt9l3Fh2MA4
https://www.youtube.com/watch?v=s2XaEboPQ7g

esle funny ones