EMPLOYEE WAS USING A HAMMER TO KNOCK A BEARING OFF A DRIVE SHAFT WHEN A PIECE OF METAL FROM THE BEARING BROKE OFF AND PENETRATED HIS LEFT HAND. THE PIECE OF METAL WAS SO SMALL THAT IT POSED NO PROBLEM (ACCORDING TO DOCTOR) BUT DOCTOR ATTEMPTED TO REMOVE IT. COULD NOT FIND METAL BUT INCISION MADE REQUIRED SUTURES.