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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. It is also important to know the correct security measures prior to beginning any project. All locks require regular cleaning and lubrication in order to ensure smooth operation. So, if you have 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 loc