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Replacing a UPVC Door Lock Your uPVC locks are an essential part of your home security system. Regular maintenance will keep them in good working order. Lubricating your lock mechanisms with a lubricant based on graphite (that won't attract dust like petroleum-based products) is crucial to keep them in good condition and functioning. Different kinds of uPVC locks provide different levels of security. Choose the best lock for your requirements. How do you change the lock on a door It's vital to maintain