THE EE WAS HOLDING A 5 1/2"" SOCKET. ANOTHER EE WAS HOLDING A 4# SLEDGE HAMMER TO HIT THE SOCKET TO SEAT A BUSHING. THE HAMMER DEFLECTED OFF A NEARBY PIECE OF METAL STRIKING THE EE'S RIGHT THUM B. THIS RESULTED IN EE'S THUMB BEING FRACTURED. ALTHOUGH THE ACTUAL EVENT TOOK PLACE ON 5-5-02, IT WAS NOT DETERMINED THAT A FRACTURE EXISTED UNTIL 5-6-02 WHEN THE EE OBTAINED XRAYS.