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Replacing a UPVC Door Lock Mechanism Replacing uPVC door lock mechanisms can be difficult if you do not have the right tools or knowledge. is also important to know the correct precautions to take before beginning any work. All locks require regular cleaning and lubrication in order to function efficiently. If you have a uPVC lock that is difficult to open or the key turns inside the handle, it might be time to replace the cylinder of your lock. Lock Cylinder A lock cylinder is a component of a upvc doo