Final Experiment

[vikram_gupta11]

As per sketch when ball hit the valve then the arm will be tilted more then 180 degree angle but at same time the tube will be slide downwards also pushing the arm to get more momentum vice versa.
The arm having ball +tube will move more than 180 degree n vice versa.
Important point is when ball will hit valve then the arm get momentum n at same time the ball+tube sliding will push the arm more increasing momentum.
The way arm will swing both side more than 180 degree.

[vikram_gupta11]

First ball will hit the valve n arm will be tilted or get momentum after that tube +ball will be slide downwards to pushing the arm more sothat  at the time of way back same mechanism could work again and again. There will be a millisecond difference in sliding tube +ball after ball hit the valve.

[vikram_gupta11]

I noticed that the weight of tube must be equal to the weight of ball or some more so that at reversal both tube+ball could push the arm with more force.

[vikram_gupta11]

First the right side arm will move more than 180 degree from initial point (180 degree) n then again move more than 180 degree after reversal.
It is clearly proving overunity in this mechanism