FlippJ
The circle change is a very difficult pitch to throw properly. I would recommend some professional instruction or try some alternatives. As has been described to me by a number of professionals, the pitcher must actually throw "through" the circle to be thrown properly. My son's first instructor taught him a change-up touching the little finger to the thumb with very little wrist action.
Most youngsters that try to throw the circle change throw it very similar to a fastball minus the index finger and the result is nothing more than a slower fastball.
My son also has large hands for his age and has had great success with a knuckle-curve thrown exactly like a fastball (very deceptive) and the bottom drops out. It is one of his favorite pitches because the delivery looks just like his fastball and ball is appreciably slower.
This is the grip that he uses:
R.
Edited: Didn't mean to get off topic but I was actually wondering if this was the Becket pitch? Also, it is very difficult to take a picture left-handed!