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How to Replace a UPVC Door Lock If your uPVC door lock is starting to stop working, it could be time for a replacement. Other indicators include a sloppy handle or a lack of performance. The process of changing a door lock made of uPVC may seem daunting at first but it's actually quite simple. All you need are the right tools and the right knowledge. Removal of the old lock While it is not for the faint-hearted knowing how to change a the lock on your door made of pvc can help you save money and increase y