At last it works !
Finally, thanks to Kenny (mentor of Team Venezuela) and our handy mentor François we managed tu cut out the chain !!
So we were at last able to test the design we imagined weeks ago to collect the balls. Hopefully it works :-D
Now that our prototype seems to be efficient, we plan to build it properly. We still have to check our sorting design and to invent a good storage one ! Next, in our roadmap, we'll think about a way to hang ;)