48 HOW TO TAKE 



as the first workman in London. I have, therefore, 

 here given specific directions, regularly numbered, 

 by having which before him he will, I trust, find it 

 almost impossible to mistake, either in taking his 

 locks to pieces, or putting them together. 



TO TAKE OFF THE HAMMER AND SPRINGS. 

 v 



MAINSPRING. 



To take off: 



1 . Put lock to full cock. 



2. Cramp the mainspring. 



3. Let down the cock, and the mainspring will drop off. 



To put it on again : 



(Let cock be left down.} 



1. Hook the end of the mainspring on the swivel, or chain. 



2. Move it up, and into its position on the lock-plate. 



3. Unscrew the cramp, and the mainspring will be replaced 



for action. 



HAMMER. 



To take off: 



1 . Shut down the hammer. 



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. 



