I don't still bend my knuckle. I have lost flexability in my bowling hand over the years, and my pro shop person didn't know about it. I have the hand of an 60 year old at age 26. I struggled to hold onto the ball for a long time. When I started to drill my own equipment a few years ago, I changed all my pitches to compinsate for the lack of flexability. I have away pitch in the middle finger of 11/16" and away pitch in the ring finger of 7/8" and a whopping 3/4" away in my thumb. Now I have no problems at all, and am bowling better than I ever have.