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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it could be the time to replace it. Other indicators are a loose handle or intermittent function. Changing a uPVC lock can appear difficult initially. However, it's a simple process. All you need is the right tools and the appropriate knowledge. Removal of the old lock It is not for the faint of heart However, learning how to change your own upvc door locks can save money while improving your home's security. It's also an excellent opportunit