WHILE WORKING ON A ROLL CRUSHER, HE NEEDED TO REMOVE ROLL CRUSHER TIRE FROM HUB SO HE COULD WELD ON IT, WHILE PULLING TIRE OFF BY HAND, THE TIRE CAME LOOSE FROM HUB, HITTING THE FLOOR IN MAINT ENANCE SHOP, THE TIRE BOUNCED BACK AND CAUGHT HIS LEFT MIDDLE FINGER BETWEEN HUB AND TIRE.