A LOCK TO PIECES. 47 



2. Keep gradually cramping the spring, till by shaking the 



lock in your hand,, you can just hear the hammer rattle, 

 from being loose. 



3. Take out the screw from behind, and the hammer will fall 



out. 



To put it on . 



1. Put the hammer in its place again. 



2. Turn in the screw. 



3. Set the spring at liberty. 



To take the hammer spring out, you must first take away the 

 hammer, and also the mainspring, to get at the screw behind. 

 The hammer-spring must be then confined till taken out, and put 

 on again to receive the hammer.] 



TO DISSECT THE SMALL WORKS OF A LOCK. 



(In doing which be careful not to mix your small screws.) 

 Having previously taken off your mainspring, 



1 . Unscrew, and take out, the scear. This must be done by 



half cocking, and then pressing the fore-part of the lock 

 against your left breast, by putting the ball of the 

 thumb against the back part of the cock; and, with 

 this, pushing the cock forward, while you squeeze to- 

 gether the scear and scear-spring, with the fore-Jin ger 

 and thumb, for the facility of taking out the scear- 

 screw. 



2. Undo the two screws, and take off the bridle. 



3. Unscrew and take out the scezr-spring. 



4. Unscrew and take off the cock, which will come from the 



tumbler by being gently tapped inwards, with the 

 handle of your turnscrew. 



5. Take out the tumbler. 



TO PUT THEM TOGETHER AGAIN. 



1. Put in the tumbler, and screw on the cock. 



2. Screw on the scear-spring. 



3. Set on the bridle with the two upper screws. 



