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Replacing a UPVC Door Lock Mechanism Replacing uPVC door lock mechanisms can be a challenge in the absence of the proper tools or know-how. It is also important to know the correct security measures prior to beginning any project. All locks require regular cleaning and lubrication to ensure smooth operation. If you have a uPVC lock that is difficult to open or your key keeps turning inside the handle, it might be time to replace the lock cylinder. Lock Cylinder A lock cylinder is the part of a upvc door t