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Replacing a UPVC Door Lock Mechanism Replacing uPVC door locks can be difficult in the absence of the right tools or knowledge. It is also important to know the correct security measures prior to beginning any task. All locks need regular cleaning and lubrication to ensure smooth operation. 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 cylinder of your lock. Lock Cylinder A lock cylinder is the part of a door made of upvc that lets y
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