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Replacing a UPVC Door Lock Mechanism It can be difficult to replace uPVC lock mechanisms in the absence of the right tools and knowledge. Before beginning any work, it's crucial to be aware of the safety precautions. All locks require regular cleaning and lubrication in order to function smoothly. If you own a uPVC lock that is difficult to open or the key turns inside the handle it could be time to replace the lock cylinder. Lock Cylinder A lock cylinder is found on a upvc u-shaped door. It allows you to