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The first line of defense is your double glazed door lock replacement lock. It will stop unauthorized entry to your home. The signs of wear and tear and also instances like moving into a new home or burglaries, could trigger the need to replace your lock.
To begin, determine your cylinder size by measuring the distance between the adjustment screw and the middle of the cylinder knob. This measurement will allow you to purchase the correct-sized lock.
Deadbolt
If you want to make sure your door is safe from intruders, it's a good idea to install a deadbolt. The bolt extends into the strike plate that is on the doorframe when locked, making it much more difficult for burglars to gain entry into the door. A single-cylinder deadbolt is activated with a key on the exterior, and a thumb-turn device situated inside. Deadbolts are only effective only if it's correctly installed, though.
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