| 摘要 |
A bowling ball thumb sleeve provides an elongated sleeve having a cylindrical wall thickness composed of a yieldable material that defines an open-ended passageway adapted to insertably receive the thumb of the bowler via either end of the sleeve as opposed to the sole opening of a finger insert. Each open end of the passageway is defined by a geometric shape or configuration at the time of sleeve usage in the bowling ball hole. The sleeve provides for at least one pad or wedge-shaped thickened portion at least at one entrance to the passageway and such may be present at both entrances. An example of an entrance shape may be oval, round or elliptical and the improved sleeve provides for a combination of these geometric shapes. The thumb sleeve is elongated and of a length greater than the length of a bowling ball hole and the player may select the entrance opening shape and ramp thickness followed by severing and removing the opposite end which then may be discarded. The selected portion is inserted into the bowling ball hole and will be of the proper length and expose the desired opening entrance shape.
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