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When to Replace Lock on UPVC Door The locks on your door made of upvc can act as if they are fighting against your key. It could be time to contact a professional locksmith. However, you can save money and also learn a new skill by tackling the task yourself. Make sure you have all the necessary tools. 1. Take off the lock that was previously used. To ensure that a upvc lock functions correctly, it must be installed correctly and maintained regularly. It is common for doors to show signs of wear and tear