Pro Pin balls are 1st quality balls as far as coverstock and weightblock are concerned. They have the normal colors, densities, finish, top weight and cosmetic appeal as a "normal" 1st quality. The key difference is in the distance of the pin.
The industry standard for most balls have the pin distance manufactured between 2" to 4" with a tolerance of +/- 1". As such, pin distances between 1 to 5" are normal with the average in the 2" to 4" range. However, when a pin distance goes beyond 5" but is not beyond the halfway point of 6 3/4", the ball by Storm standards will be classified as a 1st quality Pro Pin.
However, if the pin distance goes beyond 6 3/4" it will actually end up closer to the negative X-axis (180 degree from pin as marked) and would be classified as an X-blem. Even an X-blem with a 6 1/2" plus Pin distance is still a good ball. In order to drill it, all you need to do is measure 13 1/2" from the center of the pin to the opposite side of the ball. Use this new mark as the "pseudo pin" and drill the ball accordingly. By using this technique, an 8 1/2" pin becomes a 'normal' 5" pin which is much easier to use and will have nearly identical roll characteristics to a normal 5†pin.
Concerning Pro Pins: in many ways, a Pro Pin ball is a much better option for most bowlers than a 0 - 2" pin. For most bowlers, a balance hole located in the positive thumb quadrant will enhance the roll creating a stronger ball. However, if you use interchangeable thumbs, have a large thumb, or a long span, trying to get a balance hole in an "ideal" location to maximize backend and flip (0 - 2" Pin buffer for example) a longer pin is necessary. Also, longer pin distances are ideal for lower rev players, spinners, or high rev players that need to avoid a balance hole for tracking reasons. Hence, a Pro Pin is probably better for more players than a 2" pin which is "normal" especially with the long standing 1oz static weight rules by ABC/USBC.
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