Originally Posted by Sambooka
You don't have to loosen the valve on a KM, just make sure the ball is in there and BLOW! The valve covering allows the ball to lift and the smoke to clear. When you stop blowing the ball lowers and seals again.
See my Khalil Mamoon video for a demonstration (approx 4:30 mark) : http://www.youtube.com/watch?v=6H40cFFXDcg
like sam said, it's a tight fit. Generally it'll just take a little pressure from blowing to purge the base. A lot of times the ball bearing does get stuck once in awhile. Just the nature of the game haha.