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How to Replace Lock in UPVC Door To keep them in good functioning order, a lot of uPVC door mechanisms require regular maintenance. Using approved lubricant can make the mechanism last longer and can also help you avoid paying high locksmith costs. It may be time to replace your uPVC lock if you find an issue. Learn how to do it by yourself using these steps! You can also find out more about It's time to replace your uPVC lock if it is not working or is acting up. A broken lock is not only a nuisance, but