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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it might be time to replace it. Other indicators include a loose handle or a lack of performance. The process of changing a uPVC lock may be a bit difficult initially. However, it's simple to do. All you need are the right tools and knowledge. The old lock can be removed It's not for the faint-hearted, but learning how to change your own upvc door locks could save you money while also increasing your home's security. It's also a great