Bowling ball having adjustable selflocking finger hole plug

Claim 1

A BOWLING BALL COMPRISING: A SPHERICAL BODY PROVIDED WITH AN APERTURE IN THE OUTER SURFACE THEREOF AND A RADIALLY DISPOSED BORE COMMUNICATING WITH SAID APERTURE; A PLUG ROTATABLY POSITIONED IN SAID BORE FOR MOVEMENT ABOUT THE AXIS OF THE BORE AND PROVIDED WITH AN OUTER FACE GENERALLY FLUSH WITH SAID OUTER SURFACE OF THE BODY, SAID PLUG BEING PROVIDED WITH AT LEAST ONE FINGER-RECEIVING PASSAGE THEREIN OPENING OUTWARDLY OF THE PLUG THROUGH SAID FACE THEREOF; MEANS ON THE BODY WITHIN SAID BORE DEFINING AN ANNULAR, INWARDLY FACING SHOULDER GENERALLY COAXIAL WITH THE BORE AND SPACED FROM THE INNERMOST EXTREMITY OF THE BORE, SAID PLUG BEING PROVIDED WITH A TRANSVERSE PASSAGE THEREIN IN ALIGNMENT WITH SAID SHOULDER DEFINING MEANS WHEN SAID PLUG IS DISPOSED IN SAID BORE; AND LOCKING MEANS WITHIN THE PASSAGE OF SAID PLUG AND ENGAGEABLE WITH THE SURFACE OF THE BODY AT SAID SHOULDER DEFINING MEANS FOR NORMALLY MAINTAINING THE PLUG IN A FIXED POSITION IN THE BORE AND FOR PRECLUDING ROTATION OF THE PLUG RELATIVE TO THE BODY, SAID LOCKING MEANS INCLUDING A MEMBER MOVABLE IN SAID PASSAGE AND NORMALLY DISPOSED TO EXTEND OUTWARDLY FROM SAID PLUG INTO ENGAGEMENT WITH SAID BODY, SAID MEMBER HAVING MEANS THEREON FORMING THE BOTTOM SURFACE OF A CAVITY COMMUNICATING SAID ALIGNED WITH A FINGERRECEIVING OPENING FOR PERMITTING ACCESS THERETO FROM A LOCATION EXTERIORLY OF THE BODY TO PERMIT MOVEMENT OF THE MEMBER OUT OF ENGAGEMENT WITH THE BODY, SAID MEMBER BEING DISPOSED FOR ENGAGING SAID SHOULDER TO NORMALLY PREVENT THE REMOVAL OF SAID PLUG FROM SAID BORE WITHOUT PRECLUDING ROTATION OF SAID PLUG RELATIVE TO SAID BODY WHEN SAID MEMBER IS OUT OF ENGAGEMENT WITH THE BODY.