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Replacement Lock For UPVC Door Locks You may need to replace your uPVC door locks for convenience or necessity, such as after a burglary or the loss of your keys. Employing a locksmith for carrying out this work will cost you a bit however it's worth the peace of mind and security that a professional installation provides. Lock Cylinder The lock cylinder is the component of the locking system that allows you to open and close your door. It consists of a keyhole as well as an opening in which you i