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Dead Ball - Defective ball which does not give one his/her desired result, either by fading or deflecting after contact with the pins. Its presence is decided according to certain rules defined by the ABC. Dead Wood - Fallen pins which remain on the lane or in the gutter. They must be removed before the next delivery. Differential RG - This is the difference between the minimum and maximum RG axis in a ball. This property determines the track flare potential. The maximum allowable differential RG is 0.080 inches. The more the differential RG the more potential for track flare. Track flare increases the friction between the ball and the lane. Dodo - The scale designed to weigh balls. Durometer - This is a gage for measuring the hardness of a ball. ABC requires a minimum hardness of 72 durometer D. PBA has a minimum hardness specification of 75. Dutch 200 - A score of 200 achieved by the alternation of strikes and spares. |
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