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Replacing a UPVC Door Lock Mechanism Replacing uPVC door lock mechanisms can be a challenge if you do not have the appropriate tools or experience. It is also important to be aware of the appropriate precautions to take before beginning any task. All locks need regular maintenance and lubrication to ensure smooth operation. If you have a uPVC lock that is difficult to open or the key is turning inside the handle it could be time to replace the lock cylinder. Lock Cylinder A lock cylinder is an element