Fantastic Contraption

I used a different approach: http://FantasticContraption.com/?designId=1533505
(5 water, 3 wood, 1 counterclock, 17 seconds)

I think if it could be tweaked just a little bit so that the fourth ball doesn't get stuck and roll back down, it could probably break 9 seconds.

Edit: Fixed it.
http://FantasticContraption.com/?designId=1533634
(5 water, 3 wood, 1 counterclock, 9.33 seconds)

Edit2: Stereo, you probably FPS lag a little. I timed your contraption and it was 7.6 seconds easily.