When serving, i always have the ball on my open palm hand that is 180 degrees. During the motion of which i am tossing the ball, my hand is 180 and slowly angles itself to a 135 degree angle so the ball sort of is thrown to me so i can serve. Am i allowed to do this? or must my hand by 180 degrees open the whole time i toss the ball. Or does it not matter how my hand is after it rests in my 180 degrees palm.