Pins that have fallen down legally; if they remain on the pin deck or in the gutters after the machine has reset the pins, they must be removed before play continues.
A strike line that is popular among the big hook players in which the player stands on a high numbered board and aims for a lower numbered board; for a right handed player, this means that they start their delivery on the far left of the approach.
A balance beam scale system that measures weight and distance. Used to find whether a bowling ball will meet ABC/WIBC guidelines of imbalance for one side to another.
A device used to hold a bowling ball stationary, while being drilled. A jig can be either stationary and used on a mill press or have sliding plates to adjust for desired pitch.
Before the use of cores in bowling balls, the center of the ball was, more or less, symmetrical. In today's high tech computer designed ball cores and multiple cores designs, the cores are not evenly balanced and distributed within the center of the ball allowing balls to be drilled and designed in a manner that the apparent "weight" of the ball can shift depending on the drilling pattern;
The characteristics of the mass inside a bowling ball. This includes Moment of Inertia and Differential of RG, which in turn contribute to the balls preferred spin axis.
Spring Giveaway
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