Bowling ball grip adjustment shim and installation

Abstract

To achieve a correlation of an initially slightly oversized diameter of a drilled finger hole in a custom fitted bowling ball to a diameter of the bowler's finger using a shim inserted in a clearance between a liner otherwise, but for the clearance, adhesively secured in place in the drilled finger hole, by using preparatory to the insertion a wedge-shaped tool to delaminate the liner-securing adhesive.

What is claimed is:  
     
         1 . A method of improving the gripping efficacy of a bowling ball comprising the steps of: 
 A. measuring the diameter of a selected finger of a bowler;    B. drilling a blind finger hole having a surface approximately bounding that of said measured finger diameter in a bowling ball of plastic construction material;    C. positioning a cylindrical elastomeric liner having an exterior surface of a diameter sized to fit in said bowling ball drilled finger hole in adhesive attachment to a surface bounding said drilled finger hole;    D. delaminating said adhesive attachment at a selected location to delimit between a liner surface exposed by said delamination and an area on said finger hole surface in facing therewith a clearance therebetween sized to receive a shim in projected relation therein; and    E. projecting a shim of plastic construction material and of a selected thickness into said clearance characterized by 
 (1) a rectangular shape causing to the extent of said selected thickness thereof movement of said liner in a radially inward direction against a rear of a central longitudinal area of a finger of a bowler inserted in said drilled finger hole, and  
 (2) correspondingly urging in movement a front of said inserted finger against said liner; and  
   F. establishing gripping contact of said front of said finger against said liner;    whereby said shim adjusts by its thickness the diameter of said finger hole to match the diameter of the bowler's finger to contribute to an improved bowling ball delivery.