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How to Replace Lock in UPVC Door Many uPVC door mechanisms require regular maintenance to ensure that they are in good working order. Using approved lubricant will help the mechanism last longer, and could also save you from paying high locksmith costs. If you notice an issue with your uPVC door lock, it could be time to replace it. Follow these steps to find out how to do it yourself! Tools It could be time to replace your uPVC lock if it is not working or is acting up. A broken lock can be a hassle a