Turn the crank handle on to buffer spring, raise lock slightly till clear of guides, allow handle to come back a little, and lock to rest on top of guides, when it will be fixed and easily accessible. Barrel. Turn crank handle over against buffer spring, open cover, raise lock, and as the crank handle is allowed to come slowly back raise it and let it rest upon the top of the rear crosspiece. The cleaning rod may then be used from muzzle of barrel. Daily cleaning is absolutely necessary for at least ten days after using ball ammunition and the bore should at all times be left coated with oil. (A double-ended pull through may be used to remove hard fouling.) Treatment in Frosty Weather. In frosty weather, when water is kept in the barrel casing, a blanket or some other thick covering should be kept wrapped round the barrel casing to prevent the water freezing. The working parts of the gun should only be slightly oiled with a lightly-oiled rag. In climates where the temperature is likely to fall much below freezing point, not more than about 5 pints of water should be put into the barrel casing (25 per cent. of glycerine mixed with the water will prevent it from freezing so quickly). MUZZLE ATTACHMENT. The force of recoil is increased by the use of the muzzle attachment. Defects in the working of the gun are overcome by this means. It consists of a steel cylinder with a hole bored longitudinally through it, the front end of cylinder being partially closed by a screw. Gases escaping from the muzzle of barrel are partially confined to the interior of attachment, the pressure of the gas acting on the muzzle of barrel giving additional recoil. It is fitted by unscrewing the packing gland from the barrel casing, and screwing the attachment into the packing gland by means of the steam tube and packing gland key. The attachment should be removed from the gun and cleaned immediately after firing, all metallic fouling being carefully scraped away. THE FUSEE SPRING. On the left of the breech casing, the rear end being connected by the fusee chain and fusee with the crank, the front end is attached to breech casing by means of fusee spring box and adjusting screw which passes through front end of fusee spring box and through the nut at front end of spring. To Weigh and Adjust. Cock the lock, place loop of spring balance over knob of crank handle and pull vertically upwards, resting wrist on breech casing, the reading indicated when crank handle commences to move will be the weight of the fusee spring. This should be between 5 and 7 lbs. (for converted Mark I Guns between 10 and 12 lbs.). If spring is over, or not up to weight, remove fusee spring box and adjust by means of adjusting screw, six turns making a difference of about 1 lb. (Turning screw clockwise increases weight and vice versa.)