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Replacement Lock For UPVC Door Locks It is possible to replace the uPVC locks on your doors to ease of use or for the sake of. For instance when you've lost your keys or suffered an attack. It could cost a few dollars to hire a locksmith, but the peace of mind that is provided by 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 which you insert the key. The cyl