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When to Replace Lock on UPVC Door Sometimes upvc door locks can appear to be fighting war against your key. This is when it might be time to call in professional locksmith. You can save money and learn new skills by doing it yourself. Make sure you have all the necessary tools. 1. Take off the lock that was previously used. A door lock made of upvc has to be properly installed and regularly maintained to ensure that it functions effectively. However, it's not common for the door lock to exhibit signs of we