=Soap, castile.=—An alkaline soap used in cleaning leather equipment. Applied on a moistened sponge. =Soap, saddle (Hollingshead).=—A soap used as a dressing for leather equipment. Applied with a thick lather on a moistened sponge. =Swabbing solution, contains.=—Ammonium persulphate, 60 grains or one half spoonful smoothed off. Ammonia 28%, 6 oz. or ⅜ of a pint or 12 spoonfuls. Water, 4 oz. or ¼ pint or 8 spoonfuls. Dissolve the ammonium persulphate in the water and add the ammonia. Keep in a tightly corked bottle. Pour out only what is necessary at a time and keep the bottle corked. TOOLS AND ACCESSORIES. In the repair of all equipment, it is literally true that “a stitch in time saves nine,” and that a timely repair will save the entire article. =Tool Kits= will be kept complete and serviceable; edges of cold chisels free from nicks; drifts and punches properly shaped immediately after using; and files kept clean. To prevent unscrewing, _copper wire_ is used to lash nuts and other threaded parts which are not secured by split pins. =Contents of Leather Pouch for Spare Parts (carried in Trail Boxes of 3-inch Guns)=:— For Breechblock— 50 Split pins 1 Block latch and spring 1 Firing pin and spring 1 Firing pin sleeve 2 Handy oilers, 5-16 inch 1 Hinge pin catch 1 Lever latch spring 1 Locking bolt, nut and pin 1 Locking bolt spring 2 Oil hole covers with screws 1 Pallet pin 1 Sear 2 Trigger shaft detent For Hand Fuze Setter— 2 Corrector scale screws 1 Guide plate lock screw 2 Index bar screws 1 Index plunger and spring 2 Oil hole screws 1 Range index 3 Range ring screws 1 Stop pin screw For Bracket Fuze Setter— 1 Corrector scale screw 3 Guide screws 4 Housing screws & split washers 1 Knob washer 1 Range worm crank & knob taper pin 1 Range worm crank handle 2 Range ring screws 3 Split pins (0.125) 1 Spring and spring cover with screw 2 Stop pins with rivets For Cylinder— 1 Drain-plug, cylinder 1 Elevating & traversing lock spring 1 Filling plug (piston rod) 5 Rings Garlock packing, ¾ in =Special Wrenches=, =Spanners=, other tools and accessories will be used only for the purposes for which they are intended. This purpose is usually stamped upon the tool. In assembling or disassembling parts of the materiel, no part will be struck directly with a =hammer=. If force is necessary, a piece of _wood_ or _copper_ should be interposed between the hammer and the part struck. All nuts are provided with _split pins_ as keepers. A pair of =wire cutting pliers= is provided for use in pulling split pins, cutting wire lashings, etc. When a nut is assembled the split pin should always be inserted and properly opened.