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A shielded universal joint having a pivot head defining a primary axis. The pivot head has a ball and a neck. The ball has a longitudinal slot. The slot has a throat at the center of the ball. The imperfect socket head is provided having a socket and a pin. The socket defines a secondary axis. The s

A shielded universal joint having a pivot head defining a primary axis. The pivot head has a ball and a neck. The ball has a longitudinal slot. The slot has a throat at the center of the ball. The imperfect socket head is provided having a socket and a pin. The socket defines a secondary axis. The socket has a cavity concentric with the secondary axis. The cavity closely receives the ball. The socket has a continuous margin. The pin is joined to the socket in spaced relation to the margin. The pin extends through the passage. The pin defines a first pivot axis extending longitudinally through the pin. The pin and the throat define a second pivot axis extending through the throat and the pin perpendicularly to the first pivot axis. The socket head is simultaneously pivotal relative to the ball about both of the pivot axes.

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A guided cutting tool comprising a drill guide and a drill tool, said drill guide including a bushing and a holder, said drill tool including a pivot head defining a primary axis, said pivot head having a ball and a neck, said neck defining a primary axis, said ball having a longitudinal slot with a

A guided cutting tool comprising a drill guide and a drill tool, said drill guide including a bushing and a holder, said drill tool including a pivot head defining a primary axis, said pivot head having a ball and a neck, said neck defining a primary axis, said ball having a longitudinal slot with a throat at the center of said ball, a pivot working arm extending out from said neck, said pivot working arm including a grip, an imperforate socket head having a socket and a pin, said socket defining a secondary axis, said socket having a cavity concentric with said secondary axis, said cavity closely receiving said ball, said socket having a continuous margin, said pin being joined to said socket in spaced relation to said margin, said pin extending through said passage, said pin defining a first pivot axis extending longitudinally through said pin, said pin and said throat defining a plurality of second pivot axes extending through said throat and said pin perpendicular to said first pivot axis, said socket head being simultaneously pivotable relative to said ball about said pivot axes, and a socket working arm extending out from said socket, said socket working arm including means for retaining a drill bit corresponding in diameter to said bushing, a secondary shield rotatably mounted on said neck, said shield having an enlarged portion which overlays said socket head adjacent its distal end, said enlarged portion having a cut-out generally in the same size and shape of said socket head, said cut-out allowing said neck and margin to engage when said socket head is within said cut-out.