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When to Replace Lock on UPVC Door Sometimes, upvc door locks appear to be fighting war against your key. This is when it might be time to call professional locksmith. But you can save some money and gain something new by doing the job yourself. Just make sure you have the right tools. 1. Take off the lock that was previously used. A door lock made of upvc has to be installed correctly and regularly maintained to ensure it works effectively. It is not uncommon for locks to show signs or wear and wear ov