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When to Replace Lock on UPVC Door A door lock made of upvc may appear to be fighting against your key. It might be the time to call an expert locksmith. You can save money and gain new skills by making it yourself. Make sure you have the necessary tools. 1. Remove the old lock To ensure that a upvc lock functions properly, it must be installed correctly and maintained regularly. It is not uncommon for door locks to show signs of wear and wear over time. This can cause issues with the opening and shuttin