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Replacement Lock For UPVC Door Locks It is possible to replace the uPVC locks on your doors due to convenience or for the sake of. For instance in the event that you've lost your keys or have experienced an incident of burglary. It might cost you a bit to employ a locksmith but the assurance that comes with a professional installation is well worth it. Lock Cylinder The lock cylinder is part of the locking system that allows you to open and close your door. It is comprised of a keyhole and a slot into w