Take out lock; place loop of spring balance over knob of crank handle, and, standing on left side of gun, press down check lever with left hand. Pull spring balance vertically up, resting right wrist on breech casing. The reading indicated when crank handle commences to move will be the weight of fusee spring. This weight should be between 7 and 9 lbs. If spring is over, or not up to weight, adjust by means of vice pin. Generally six clicks (three revolutions) make a difference of about 1 lb. Adjust by ½–lbs. as a rule. Turning vice pin clockwise increases weight and vice versa. Tension of spring should always be kept as high as possible, consistent with maintaining normal rate of 500 rounds per minute. TO STRIP AND ASSEMBLE GUN. The gun is stripped in the following order:— Lock. Clear extractor by revolving crank handle twice; pull crank handle on to roller; raise rear cover, place finger between extractor and stop, lift lock, at same time allowing crank handle to move slowly forward until lock is released from side plates. Give lock one-sixth of a turn in either direction and lift out. Feed Block. Release front cover catch, raise front cover, and lift out. Fusee Spring Box. With right hand at rear and left hand at front, press box forward until clear of lugs and remove. Disconnect fusee chain and remove box and spring. Care should be taken to throw no cross strain on chain. Fusee. Turn fusee to rear until lugs on stem are free to be withdrawn. Ball Firing Attachment. Withdraw split pin. Give outer casing one-sixth turn and remove it. Unscrew front cone. Loosen clamping screw of muzzle cup and revolve cup till clamping screw coincides with flat on barrel. Remove muzzle cup. Unscrew and remove gland. Slides, Right and Left. Raise rear cover, unscrew rear crosspiece screwed fixing T-pin, and hinge down rear crosspiece. Pull out sides. Recoiling Portion. Draw recoiling portion out to rear. Disconnect side plates from barrel, removing left one first (for convenience only). If necessary, by taking out fixing pin, crank handle can be driven off with a drift and hammer, but as a rule this should not be stripped. Roller. Remove split fixing pin, collar, and roller. To Strip Lock. (_a_) See that lock is cocked; force out side lever split pin and axis bush. Remove side levers and extractor levers and slide extractor from front of lock casing. (_b_) Release lock spring and push out the trigger and tumbler axis pins. (_c_) Remove trigger, tumbler, lock spring, firing pin and sear with spring. To strip extractor, push out gib spring cover and remove spring and gib. Tangent Sight and Spring.