EE AND OTHER WERE MAKING A SPLICE IN THE 1W BELT. OTHER WAS HITTING THE PLUNGER ON THE SPLICE MACHINE WITH A 2 1/2 LB HAMMER. EE REACHED UP WITH HIS LEFT HAND TO CHANGE THE PLUNGER AS EE WAS O NT HE DOWN STROKE WITH THE HAMMER. THE HAMMER STRUCK EE ON HIS LEFT HAND AND RING FINGER AREA FRACTURING HIS FINGER IN THE AREA OF HIS KNUCKLE.