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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 signs to look out for include a loose handle or sporadic functionality. The process of changing a uPVC lock may be a bit difficult initially. But, it's a simple process. All you require is the right tools and the appropriate knowledge. Removing 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 the security of your home