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Replacement Lock For UPVC Door Locks You may want to replace the uPVC locks on your doors to ease of use or a need. For example in the event that you've lost your keys or suffered a break-in. Hiring a locksmith to carry the work isn't cheap however it's worth the peace of mind and security that a professional installation provides. Lock Cylinder The lock cylinder is part of the locking system that allows you to open and close your door. It comes with a keyhole and a slot to insert the key. The cylinder is p