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Replacing a UPVC Door Lock Your uPVC door locks are an essential part of your security system. Regular maintenance will keep them in top shape. Lubricating your lock mechanisms using a graphite-based lubricant (that won't attract dust like petroleum-based products) is key to keeping them in good condition and functioning. Different kinds of uPVC locks come with different levels of security. Choose the best lock for your requirements. How do you change a door lock The door lock is a vital element of your