Rest the barrel casing on a table or bench, with the filling hole uppermost, and the breech casing clear of the bench; place the left hand under the breech casing and strike the top edges alternately with a mallet, when the casings will come apart. Lift the ejector tube spring with the point of the screwdriver and tap out the spring with the drift and hammer. (In converted guns remove fixing wire and unscrew fixing screws.) NOTE.—The breech and barrel casings should only be separated when repairs are necessary. Care must be taken not to strike the barrel casing, and the blows should be struck as close to the dovetailing as possible. (xi) =Lock.= (_a_) Release the lock spring, lay the lock on a bench, left side uppermost. Drive out the sear, tumbler, and lock spring axis pins. (_b_) Remove the keeper bracket, extractor levers, lock spring, tumbler, firing pin, and sear. (_c_) Drive out the trigger axis pin, extractor stop keeper pin, remove the trigger, extractor stop, and slide the extractor from the face of the lock casing. (_d_) Push out the gib spring cover, take out the gib spring and gib. (_e_) Drive out the extractor spring fixing pin, and remove the extractor spring. (In converted guns the extractor spring is riveted to the extractor.) NOTE.—(_e_) should only be done in case of breakage. (xii) =Feed Block.= (_a_) Drive out the spring fixing pin of the top and bottom levers, drive out the bottom lever and remove the top lever and slide. (_b_) Drive out the axis pin of the bottom pawls and remove pawls with feed block spring. (In converted guns unscrew fixing screws and remove feed block springs.) (_c_) Drive out the fixing pin of the band roller axis pin, remove the collar, axis pin, and band roller. (_d_) Remove the top pawls from the slide by pressing them outwards. The springs for the pawls, if weak or broken, are only to be removed by an armourer or qualified artificer. (xiii) =Tangent Sight.= (_a_) Remove the top fixing screw of the graduated plate. (_b_) Run the slide off the stem. (_c_) Remove the fixing screw of the milled head, and lift the latter off the slide. (_d_) Remove the fixing pin, pawl and pinion from the slide. (_e_) Place the milled head, face upwards, on a bench; then with a drift, applied to the rectangular nib on the spring slide, knock the latter down flush with the face, when it can be lifted out with the pliers. (xiv) =Rear Crosspiece.= (_a_) Drive out the axis pin of the firing lever, and remove the latter with its spiral spring. (_b_) Drive out the axis pin of the safety catch, and lift out the latter, also the piston and spring from their seating. (_c_) Remove the pivot screw and shutter. (_d_) Unscrew, from the handles, the milled heads with their leather washers and oil brushes. EXAMINATION AND TESTING. Before assembling the gun all parts should be tried in their places separately to see that they work freely, and test friction of recoiling portions as follows:—