EE WAS TIGHTENING THREADED DOOR LATCHES ON EAST ACCESS DOOR OF WEST HAZEMAG CRUSHER USING AN 1 1/2"" COMBINATION WRENCH. IN ORDER TO TIGHTEN TOP LATCH EE USED A HAMMER TO STRIKE THE WRENCH. WRENCH SLIPPED OFF THE HEX NUT ON LATCH PINCHING THE EE'S FINGER BETWEEN THE WRENCH AND LOWER LATCH.