QUOTE(The Critic @ May 10, 2006 -> 07:30 PM)
Basically, you grab into the ball with your fingernails and kinda push it towards the plate.
It grabs a wind stream and goes wherever the breeze takes it.
Very easy on the arm, but extremely hard to control.
I've thrown a few knuckleballs before, and let me stress the few part. Lol.
But, I have a semi-serious shoulder problem, and everything hurts after about 20-25 pitches, so I really have no idea about how much more stress there is.