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Replacing a UPVC Door Lock Mechanism Replacing uPVC door lock mechanisms can be difficult when you don't have the appropriate tools or experience. It is also crucial to be aware of the appropriate safety measures before starting any task. All locks need regular cleaning and lubrication to ensure smooth operation. If you own a uPVC lock that is difficult to open or the key is turning inside the handle, it might be time to replace the lock's cylinder. Lock Cylinder A lock cylinder is an element of a upvc