walter ray williams, jr., is the master at using an end over end roll when he wants to play the lanes straighter from the outside line. this type of shot works great when the lanes are fresh with oiled heads and dry backends. when the lanes start to breakdown he'll move left and hook the ball. this requires a different release. he will impart some side turn on the ball at release. this will cause the ball to go to the right and recover on the backend. a ball that has a low grit of sanding may hook too early or hook and quit. it depends upon the lane condition you're bowling on.