Abstract: A bowling ball thumb insert has a first and second sleeve. The second sleeve is retained in the first sleeve. The first sleeve has a coupling mechanism including a ledge extending radially inward towards the center of the sleeve. A positioning gap is adjacent the ledge. A second sleeve is positioned inside the first sleeve. The second sleeve includes a coupling mechanism. The second sleeve coupling mechanism includes a wing extending radially outward from the outer surface of the second sleeve. The wing passes through the positioning gap. When one of the sleeves is rotated with respect to the other, the sleeves lock together.

Abstract: A bowling center bowling ball system has a mechanism to size a bowler's hand. The mechanism provides the bowler with a hand size, selected from a small number of hand sizes, that corresponds to the best bowling ball fit for the bowler. A plurality of bowling balls each having a desired weight and hole set is provided. The hole sets corresponds to the small number of hand sizes. The plurality of individual balls are coded such that once the bowler has his hand size and ball weight, the bowler can select his specific bowling ball using the coded system on the bowling balls to provide the bowler with a desired weight bowling ball and finger hole set that corresponds to the bowler's hand size.

Abstract: A bowling ball thumb insert has a first and second sleeve. The second sleeve is retained in the first sleeve. The first sleeve has a coupling mechanism including a ledge extending radially inward towards the center of the sleeve. A positioning gap is adjacent the ledge. A second sleeve is positioned inside the first sleeve. The second sleeve includes a coupling mechanism. The second sleeve coupling mechanism includes a wing extending radially outward from the outer surface of the second sleeve. The wing passes through the positioning gap. When one of the sleeves is rotated with respect to the other, the sleeves lock together.

Abstract: A finger grip (10) for a bowling ball (14) has a mechanism (20) to retain the grip to a bowler's finger (12). A pad (24) is included to contact the bowling ball (14). The bowling ball (14) is associated with the retention mechanism. Also the pad (24) has an arcuate surface.

Abstract: A finger grip has a resilient tubular body which is adapted to be inserted into a finger hole of a bowling ball. The insert has a generally cylindrical inner wall surface with a pair of opposing gripping surfaces at each end of the insert. Thus, the insert provides four gripping members in a single insert.

Abstract: A finger grip (10) for a bowling ball (14) has a mechanism (20) to retain the grip to a bowler's finger (12). A pad (24) is included to contact the bowling ball (14). The bowling ball (14) is associated with the retention mechanism. Also the pad (24) has an arcuate surface.

Abstract: A template for weighting and placement of finger holes in a bowling ball has a meridian plane indicator and an angular indicator. The meridian indicator includes a scale which determines the distance between placements of finger holes and a thumb hole for bowling balls. A second scale is on the angular indicator to determine placement of a weighted center of gravity with respect to a bowling ball pin. The angular indicator is positioned with respect to the meridian plane indicator such that the meridian plane indicator forms the supplementary plane of the angle indicating member.

Abstract: A finger hole insert for a bowling ball which is formed of a resilient tubular body and is adapted to be inserted into a finger hole. The insert has an oblong cylindrical inner wall surface defining finger openings at opposite terminal ends of the insert which are sized to permit insertion of a bowler's finger therein. The finger openings have thickened parallel planar finger pads therein adapted for cushioning the bowler's finger. The finger openings also have opposed arcuate finger pads for augmenting the spin and lift applied during delivery of the bowling ball. In this manner, the bowler has a preferential choice between the two functions provided by each finger opening of the insert.

Abstract: A finger hole insert for a bowling ball which is formed of a resilient tubular body and is adapted to be inserted into a finger hole. The insert has a generally cylindrical inner wall surface defining first and second finger openings at opposite terminal ends of the insert which are sized to permit insertion of a bowler's finger therein. The first finger opening has a thickened finger pad therein adapted for cushioning the bowler's finger. The second finger opening has a plurality of ribs extending in longitudinal spaced relationship around its inner periphery adapted to augment the spin and lift applied during delivery of the bowling ball. In this manner, the bowler's has a preferential choice between the function provided by each finger opening of the insert.

Abstract: A finger hole insert for a bowling ball which is formed of a resilient tubular body and is adapted to be inserted into a finger hole. The insert has a generally cylindrical inner wall surface defining first and second finger openings at opposite terminal ends of the insert which are sized to permit insertion of a bowler's finger therein. The first finger opening has a thickened finger pad therein adapted for cushioning the bowler's finger. The second finger opening has a plurality of ribs extending in longitudinal spaced relationship around its inner periphery adapted to augment the spin and lift applied during delivery of the bowling ball. In this manner, the bowler's has a preferential choice between the function provided by each finger opening of the insert. In another embodiment, the inner wall is textured.

Abstract: A finger hole insert for a bowling ball which is formed of a resilient tubular body and is adapted to be inserted into a finger hole. The insert has a generally cylindrical inner wall surface defining first and second finger openings at opposite terminal ends of the insert which are sized to permit insertion of a bowler's finger therein. The first finger opening has a thickened arcuate finger pad therein adapted for cushioning the bowler's finger. The second finger opening has a plurality of ribs extending in longitudinal spaced relationship around its inner periphery adapted to augment the spin and lift applied during delivery of the bowling ball. In this manner, the bowler has a preferential choice between the function provided by each finger opening of the insert. In another embodiment, the first opening may include a textured gripping surface.

Abstract: A finger hole insert for a bowling ball which is formed of a resilient tubular body and is adapted to be inserted into a finger hole. The insert has a generally cylindrical inner wall surface defining first and second finger openings at opposite terminal ends of the insert which are sized to permit insertion of a bowler's finger therein. The first finger opening has a thickened finger pad therein adapted for cushioning the bowler's finger. The second finger opening has a plurality of ribs extending in longitudinal spaced relationship around its inner periphery adapted to augment the spin and lift applied during delivery of the bowling ball. In this manner, the bowler has a preferential choice between the function provided by each finger opening of the insert.