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How to Replace Lock in UPVC Door To ensure they are in good working order, many uPVC door mechanisms require regular maintenance. The mechanism will last longer by using an approved lubricant by the manufacturer. It is also possible to avoid paying for expensive locksmith charges. If you find problems with your uPVC door lock, it might be the time to replace it. Learn how to do it by yourself with these steps! Tools If your uPVC door lock is acting up or has been unable to function, it might be time to re