Method of adapting a relatively small number of bowling balls for testing use by a relatively large number of bowlers

摘要

A method for adapting a relatively small number of bowling balls for use in testing by a relatively large number of bowlers having different hand sizes. The method includes the steps of predrilling a pair of finger holes of a standard size in each of a relatively small number of bowling balls, which finger holes are shaped to receive removable finger inserts of varying sizes. The next step is the predrilling of a thumb hole in each of a relatively small number of bowling balls with the thumb hole in each bowling ball being located at a different, predetermined distance from a pair of finger holes so that each of the thumb holes of the bowling balls are at a different distance from a pair of finger holes. The following step is the installation of a removable insert in each of the thumb holes. Finally, the removable thumb insert is sized to accommodate the thumb of a particular bowler.