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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it may be the time to replace it. Other telltale signs include a sloppy handle or a lack of functionality. The process of changing a door lock made of uPVC may appear daunting at first but it's actually a simple task. All you need are the right tools and knowledge. Take off the lock that was previously used. It is not for the faint of heart However, learning how to modify your own upvc door locks can save you money while also increasing your