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How to Replace Lock in UPVC Door Many uPVC door mechanisms need regular maintenance to ensure that they are in good working order. Using approved lubricant can make the mechanism last longer, and could also help you avoid expensive locksmith fees. If you find an issue with your uPVC door lock, it might be the time to replace it. Learn how to do it by yourself using these steps! Tools If your uPVC door lock is acting up or been unable to function, it might be the time to replace it. A broken lock isn't