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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it could be time to replace it. Other signs to look out for include a sloppy handle or inconsistent performance. Changing a uPVC door lock might seem overwhelming at first, but it is actually a straightforward task. All you require is the right tools and understanding. Take off the lock that was previously used. While it is not for the faint-hearted, learning how to change your door lock with upvc yourself can help you save money and improve