Pin position is realitive to length, as Charles has stated. From what I have seen in my game is less than 2" pin position there is very little difference in length with a pearl ball. I have two Thing Returns both have same drilling, the difference is one pin under ring the other pin over I can not detect much difference in length gained or lost between the two layouts, what I do see is the quicker transistion from hook to roll in the pin up ball. For that reason I never drill a pearl with the pin up, nothing higher than ring finger. Due to core in the Zr40 and the length the cover gives you I see no need for pin up in my game with this ball. It was designed for natural length ( all ready in the ball )with a more than average controlled recovery or backend movement, the key word being controlled. Not snappy as in other pearls, with controlled violence at the pin deck. IMO the best ball D/T has produced to date.
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Steve
Stars N Strikes Pro Shop
www.dynothane.com Capt Ramius "Vacilli, give me one ping, and one ping only"