Knurled locking threaded element

Claim 1

AN ELEMENT COMPRISING A BODY HAVING EXTERNAL FIRST THREADS DISPOSED ABOUT AN AXIS AND ADAPTED TO BE SCREWED INTO A MATING THREAD IN A CARRIER PART, SAID BODY HAVING SECOND THREADS FOR CONNECTION TO ANOTHER MEMBER, SAID BODY HAVING A RADIALLY EXPANSIBLE ESSENTIALLY TUBULAR LOCKING PORTION NEAR THE AXIALLY OUTER END OF THE BODY CARRYING A FIRST PORTION OF THE EXTERNAL THREADS WHICH IS SHAPED TO PRESENT A SERIES OF RADIALLY OUTWARDLY PROJECTING SERRATIONS AT DIFFERENT LOCATIONS ALONG THE CIRCULAR EXTENT OF SAID PORTION OF THE EXTERNAL THREADS, SAID EXTERNAL THREADS HAVING A NON-SERRATED SECOND PORTION AXIALLY INWARDLY OF SAID FIRST PORTION, SAID LOCKING PORTION OF THE BODY CONTAINING AN ESSENTIALLY AXIALLY EXTENDING INTERNAL SURFACE NEAR ITS AXIALLY OUTER END AND RADIALLY OPPOSITE SAID SERRATIONS FOR ENGAGEMENT BY A TOOL TO EXPAND SAID LOCKING PORTION, SAID LOCKING PORTION BEING FORMED OF A MATERIAL CAPABLE OF SUBSTANTIAL EXPANSION WITHOUT TEARING, SAID LOCKING PORTION TERMINATING AT ITS AXIALLY OUTER END IN AN AXIALLY OUTER END SURFACE AND HAVING A SHORT NON-SERRATED ESSENTIALLY CYLINDRICAL EXTERNAL SURFACE OF ARCUATE CROSS-SECTION AXIALLY OUTWARDLY OF SAID SERRATIONS AND EXTENDING AXIALLY BETWEEN THE SERRATIONS AND SAID OUTER END SURFACE, SAID LOCKING PORTION CONTAINING AT LEAST ONE RECESS EXTENDING AXIALLY INWARDLY INTO THE MATERIAL OF SAID TUBULAR LOCKING PORTION FROM SAID OUTER END SURFACE AND EXTENDING THRROUGH THE ENTIRE RADIAL THICKNESS OF THE WALL OF SAID LOCKING PORTION, SAID RECESS BEING CONFINED SUBSTANTIALLY TO THE LOCATION OF SAID NON-