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Bolts compensate for where no locking device are usually fitted, the top or bottom of a door, a place where a bar could be inserted
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Fitting Mortice Bolts
 
Where the two lines cross, bore a hole using a 13mm wood bit through from the inside face of the door, but do not drill all the way through - stop as soon as the bolt hole is reached. Before the bolt body can be fitted to the door, the front faceplate will need to be recessed. Insert the bolt into the hole, and rotate it until the edge of the plate is parallel to the edge of the door. Whilst in this position, mark around the outside of the front plate with a pencil or trimming knife, as in 'Fig 6', then remove the bolt and chisel out the wood, working to the inside of the lines, and recess just deep enough to receive the front plate so that it sits flush with the edge of the door.
Now the bolt can be fixed in position, and if the marking out has been accurate, it should be possible to see the bolt's keyhole through the hole that has been bored out of the door face. Next, the keyhole cover will need to be fitted, and as it is a very thin plate it can be surface fixed with no need of recessing. It is found to be easier to position the cover if the key is pushed through the plate first, and then inserted into the bolt where it's correct position can be centralised around the key. While in this position, us a bradawl to pierce the wood surface through the two screw holes in the cover plate, remove the key, and screw the plate in position with the screws provided. With the installation of the bolt complete, the door frame will now need to be marked at the position where the bolt will enter the frame as it comes out of the door when closed, so that a hole can be bored out at this point.

Close examination of the bolt shows that on the end tip of the  bolt there is a small spike, which will conveniently mark this position without the need of measuring. To use this correctly, simply close and lock the door so that it is in its normal locked position, and turn the key of the mortice bolt until you can see that the small spike has made a small indentation in the frame. Now using a wood bit slightly larger than the bolt, drill a hole into the door frame that is slightly deeper than the amount that the bolt protrudes out of the door, then close the door to confirm that the bolt enters into it. To compensate for the weakness of the timber, and to prevent any damage to it, a metal plate is provided.  This plate should be positioned over the hole, and screwed in position, parallel to the edge of the frame, then, using a pencil or trimming knife, mark its position.  The plate can now be removed, and by using a suitably sized wood chisel, chisel out the timber so that the metal plate is recessed and sits flush with the surface of the door frame, and re fix using the screws provided. When you are happy with the installation, proceed to fit the bottom bolt, which is fitted in exactly the same way, other than it is positioned 200mm from the bottom  of the door.


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