In my experiences, tucking the pinky gets the ball down the lane a lot easier. It helps me get my thumb out of the ball faster. The ball in turn, has more motion at the end of the pattern. I find when I tuck my pinky, I get about 2 more boards of backend hook. Enough to leave a 4, or 4-9 where I was striking earlier.
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Proud Supporter of Rob Stone
Obviously, you aren't a golfer.
Some stayed in the foothills, some washed logs like teeth.