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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. Before beginning any project, it is crucial to be aware of the safety measures. All locks require regular cleaning and lubrication in order to operate smoothly. If you're experiencing a hard-to-open uPVC door or the lock keeps turning inside the handle, it could be time to replace the lock cylinder. Lock Cylinder A lock cylinder is a component of a door mad