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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 proper tools and know-how. Before starting any work, it's important to be aware of the safety precautions. All locks require regular cleaning and lubrication to function efficiently. If you're experiencing an impossible-to-open uPVC door or the key is constantly turning inside the handle, it could be time for a replacement lock cylinder. Lock Cylinder A lock cylinder is the part of a upvc door