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How to Replace Lock in UPVC Door To keep them in good working order, many uPVC door mechanisms require regular maintenance. Lubricant that is approved by the manufacturer will help the mechanism last longer and also help you avoid paying high locksmith costs. If you find a problem with your uPVC door lock, it may be time to replace it. Learn how to do it yourself with these steps! Tools If your uPVC door lock is acting up or has stopped working, it may be the right time to replace it. A broken lock can