Abstract: A improved, and simplified method of producing a finger or thumb hole (gripping hole) copied from an existing reference hole in a bowling ball. The essential improvement in this invention being an improved method of replicating a reference hole of a bowling ball with ease and relative cost efficiency and to have the ability to change the orientation of the new hole in pitch and distance. A silicone mold taken of the reference hole allows a urethane sleave to be created that features a duplicative a) length of the reference hole; b) texture of the inner portion of the reference hole; c) bevel at the top of the reference hole; and d) shape of the reference hole so that these dimensions can be copied immediately, or at a later date, onto a new ball. A variety of hole sizes (eg. 11/8, 11/4, 13/8 inches) can also be used to remedy any change or correction in the finger size.