Mmeece, HighStrung and Joe720 hit their spots. After a pitcher can precisely repeat hitting the center of the strike zone within an inch or two, then the spot can be moved by "thinking" or "visualizing" the ball going to the spot you want to hit (Mmeece & HighStrung). I too have found intentional changes in mechanics result in huge changes of location, otherwise known as loss of control.This is very similar to what I've got DD doing. If you want to move the pitch, "think" about moving it but mechanically do everything the same. It's surprising, but her results have been really good. Actually trying to change something in order to move location has always resulted in too big of a change. In all reality, moving a pitch by 4" means changing the direction of the pitch by approx .5 degrees from 43ft.