Everyone, please take notice of how far under the ball PDW's fingers are in the flat spot of his down swing. Most amateur bowlers closer to the equator taking away a lot of rev potential. The further around the ball the fingers can't turn the ball the more revs it will generate. That isn't the hand turning but rather the ball rolling off the end of the fingers. If you can get it to roll of the fingers for say half the ball compared to a quarter of the ball you will generate more revs.
Bookmarks