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Replacing a UPVC Door Lock Mechanism Replacing uPVC door lock mechanisms can be difficult in the absence of the appropriate tools or experience. It is also crucial to be aware of the appropriate security measures prior to beginning any project. All locks require regular cleaning and lubrication to operate smoothly. If you have a uPVC lock that is difficult to open or the key turns inside the handle it could be time to replace the lock's cylinder. Lock Cylinder A lock cylinder can be located on a u-shaped