[macker]

These guys are pretty good :

Weights and measures : http://www.youtube.com/watch?v=k5g-DeG0MJc

No rest : http://www.youtube.com/watch?v=3iUHf...eature=related

The chambers and the valves : http://www.youtube.com/watch?v=VR3Dv74htec&ob=av2e