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How to Replace a UPVC Door Lock If your uPVC door lock is starting to jam, it might be time to replace it. Other indicators are a sloppy handle, or a lack of function. Changing a uPVC lock can be a bit difficult at first. But, it's a simple process. All you need are the right tools and understanding. Take off the lock that was previously used. Although it's not for the faint of heart Learning how to change the upvc door lock yourself can save you money and improve your home security. It's also an