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Different pitches and spans will dictate how you need to release the ball, giving you a different ball reaction from each release and/or pitch/span.
Now let take for example, a person with a very stiff thumb, kinda like jj. When he puts his thumb straight down into the ball, his palm is not even close to touching the surface of the ball. The ball is laying differently in this persons hand, vs. the person with a hinged thumb. Therefore, it will be nearly impossible for both bowlers to release the ball the same way.
As a matter of fact, the person with his palm off the ball will be more like a spinner or have a lot of axis tilt. For the most part, bowlers with more forward roll usually have a stronger ball and/or more revs on the ball, because they are more behind the ball at release.
So, because bowlers hands are different, bowlers who were born with certain hand characteristics will naturally have a better release than some other bowlers. In order to compensate for this, different pitches and beveling techniques need to be employed to "level the playing field" so to speak.
If it's more desirable to have your palm laying more flat on the ball, because now you can get more forward roll and less axis tilt, the person with a stiff thumb is at a disadvantage. So, in order to get this persons hand more flat on the ball, they have to use some away pitch, as well as reverse combined with bevel, to have his hand laying more flat on the ball.
=:^D
Edited on 10/14/2004 12:50 PM
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For the average bowler with 5-6 balls bowling a couple leagues a week, this might be a little much.
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The BT fitter uses a measurement involving the lines in the cylinder to determine lateral pitch.
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You will find that as most stiff thumbed bowlers go to more under they have a tendency to grip the ball more instead of having a relaxed grip.
By the way if you are interested in what my pitches are now. 1/2 under 1/4 away Span is 4 5/16 X 4 7/16
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