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Replacing a UPVC Door Lock Mechanism It can be difficult to replace uPVC lock mechanisms when you don't have the appropriate tools and understanding. Before you begin any work, it is crucial to be aware of the safety precautions. 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 might be time to replace the cylinder of your lock. Lock Cylinder A lock cylinder is the part of a door