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How to Replace Lock in UPVC Door To ensure they are in good condition, many uPVC door mechanisms require regular maintenance. The mechanism will last longer when you use a lubricant approved by the manufacturer. You will also avoid paying expensive locksmith fees. It might be time to replace your uPVC lock if you spot an issue. Follow these steps to find out how to replace it yourself! Tools If your uPVC door lock is acting up or been unable to function, it might be the time to replace it. A damaged