Replaceable drill bit nozzles

Claim 1

A DRILL BIT HAVING A PASSAGE FOR DISCHARGING FLUID FROM THE BIT, A NOZZLE DISPOSED IN THE PASSAGE AND THROUH WHICH FLUID IS DISCHARGED THEREFROM, SAID NOZZLE HAVING AN EXTERNAL TRANSVERSE GROOVE THEREIN, SAID BIT HAVING A FIRST HOLE ALIGNED WITH SAID GROOVE AND EXTENDING FROM A FIRST OUTER SURFACE OF THE BIT TO A LOCATION BEYOND SAID GROOVE, SAID BIT HAVING A SECOND HOLE OF LARGER CROSSSECTION THAN SAID FIRST HOLE INTERSECTING SAID FIRST HOLE AT A POINT BEYOND SAID GROOVE AND OPENING OUTWARDLY THROUGH A SECOND OUTER SURFACE OF THE BIT AND DISPOSED AT AN OBTUSE ANGLE TO SAID FIRST HOLE, SAID OBTUSE ANGLE FACING IN A DIRECTION AWAY FROM SAID NOZZLE, AND A HEADLESS RETAINING PIN INSERTABLE FROM SAID FIRST OUTER SURFACE INTO SAID FIRST HOLE, GROOVE AND SECOND HOLE TO RETAIN SAID NOZZLE IN SAID PASSAGE, SAID PIN HAVING A FIRST PORTION IN SAID FIRST HOLE AND GROOVE AND A SECOND PORTION IN SAID SECOND HOLE BENT AT A SUBSTANTIAL ANGLE TO SAID FIRST PORTION TO HOLD SAID PIN IN SAID HOLES AND GROOVE, THE MAXIMUM CROSSSECTION OF SAID PIN ALONG ITS LENGTH BEING NO GREATER THAN THE MINIMUM CROSS-SECTION OF SAID FIRST HOLE TO ENABLE SAID PIN TO BE SHIFTED COMPLETELY FROM SAID FIRST HOLE INTO