EE WAS HELPING THE MECHANIC TO REPLACE A PIN ON THE HARD DRIVE FOR A D11N BULLDOZER-MACHINE #573. EE WAS HOLDING A HAND TOOL CALL A B + O WHILE COWORKER WAS HITTING IT WITH A SLEDGE HAMMER INO RDER TO DRIVE THE PIN OUT. WHILE COWORKER WAS MIDWAY THRU A SWING A PIECE OF MUD FELL HITTING HIS SLEDGEHAMMER THUS DEFLECTING HIS SWING WHICH HIT EE IN THE LEFT HAND, MIDDLE FINGER. 5 STITCH