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Replacing a UPVC Door Lock Mechanism It can be difficult to replace uPVC lock mechanisms if you don't have the proper tools and know-how. It is also crucial to know the correct security measures prior to beginning any project. All locks require regular cleaning and lubrication in order to function efficiently. If you're experiencing difficult-to-open uPVC door or the lock keeps turning inside the handle, it might be time to replace the lock cylinder. Lock Cylinder A lock cylinder is found on a upvc-shap