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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. Utilizing lubricant approved for use can make the mechanism last longer, and could also save you from paying high locksmith costs. It could be time to replace your uPVC lock if you find problems. Learn how to do it by yourself by following these steps! You can also learn more about If your uPVC door lock is acting up or has stopped working, it could be the time to replace it