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How to Replace Lock in UPVC Door Many uPVC door mechanisms require regular maintenance to ensure they are in good condition. Lubricant that is approved by the manufacturer can make the mechanism last longer, and could also help you avoid costly locksmith fees. It might be time to replace your uPVC lock if you spot a problem. Follow these steps to learn how to do it yourself! You can also find out more about It may be time to replace your uPVC lock if it is not functioning or is acting up. A broken lock