They offer the ability to have the same feel in every ball, and the ability The thumb slug has the locking mechanism attached to the bottom of.
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This revolutionary two-piece insert assembly allows bowlers to remove and interchange thumb inserts from one ball to another for the same fit and feel every .
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Author Topic: Removable thumb insert (Read 6824 times) . Bowling Journal and Ball Registry & Grip Specs allBowling.com Chat.