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Replacing a UPVC Door Lock Your uPVC locks are a vital component of your home's security system. Regular maintenance will ensure they are in good working order. Lubricating your lock mechanisms with a lubricant based on graphite (that will not attract dust like petroleum-based products) is essential to keep them smooth and functional. Different kinds of uPVC locks come with different levels of security. Pick the lock that best suits your needs. How do you replace the lock on a door? It is essential to