LEGO GBC Module : Inconstancy of Universal Joint 

Possibly. However, I think vibration mainly cause from weak cantilever frame design.

@@Jackal82JPN Don't you think it is due to the non-constant-velocity joint ?

@@Nico71Fr The vibration is caused by a non-constant velocity joint, and this module takes advantage of this property by lifting the ball at the moment the hand pauses at the lowest point.

reliability will be confirmed at JBF2024 show

@@Jackal82JPN I dont pretend to understand the mechanics behind it but it looks very cool I hope that it is reliable and that will be confirmed at JBF2024 :-)