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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 proper safety measures before starting any work. All locks require regular cleaning and lubrication to function 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 is an element of a upvc door that allows you to lock and unl
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