EE WAS IN THE SHOP ASSISTING TWO OTHER EE'S WITH END LOADER MAINTENANCE. THEY STARTED TO HOIST A 55 GALLON DRUM OF ANTIFREEZE UP ONTO THE END LOADER. AS THE WEIGHT WAS PICKED UP ON THE DRUM, O NE OF THE DRUM ANCHOR HOOKS DISLODGED ALLOWING THE HOIST BLOCK TO SWING STRIKING HIM ABOVE THE LEFT EYE. THE INCIDENT CAUSED A LACERATION REQUIRING A COUPLE OF SUTURES TO CLOSE.