Abstract: An interchangeable finger insert system for a bowling ball is provided. An inner sleeve has a cylindrical opening defined at a top end. A base encloses a bottom end of the inner sleeve. A fastener-head feature is defined in the base and accessible through the cylindrical opening. An engagement feature is formed along an exterior surface and configured to allow the inner sleeve to be rotationally inserted into an internal bore. A fastening tool with an elongated shaft and a locking feature defined at a distal end of the shaft is provided. The locking feature shaped to engage the fastener-head feature defined on the inner sleeve. The locking feature of the fastening tool engages the fastener-head feature on the inner sleeve, and rotation of the fastening tool is configured to rotate the inner sleeve into the internal bore thereby locking the inner sleeve in the bowling ball.

Abstract: An interchangeable finger insert system for a bowling ball is provided. An inner sleeve has a cylindrical opening defined at a top end. A base encloses a bottom end of the inner sleeve. A fastener-head feature is defined in the base and accessible through the cylindrical opening. An engagement feature is formed along an exterior surface and configured to allow the inner sleeve to be rotationally inserted into an internal bore. A fastening tool with an elongated shaft and a locking feature defined at a distal end of the shaft is provided. The locking feature shaped to engage the fastener-head feature defined on the inner sleeve. The locking feature of the fastening tool engages the fastener-head feature on the inner sleeve, and rotation of the fastening tool is configured to rotate the inner sleeve into the internal bore thereby locking the inner sleeve in the bowling ball.