A LOCK TO PIECES. 49 



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

 put on again to receive the hammer. 



In cramping springs, be sure never to confine them closer 

 than is absolutely necessary, otherwise you will soon weaken 

 and spoil them. 



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 sccar. 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 

 .vf/wrrr together the war and scear-spring, with the 

 fore-/ingc r 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 swar- 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. 



4-. Put in the scear ; to open a clear passage for the screw 

 of which, you must observe the same pressure of the 

 fore-finger and thumb on the scear and scear-spring, 

 and the pushing of the cock forward, as before de- 

 scribed for taking off the scear. 



The reason for this pressure being required to put in the scear 



E 



