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How to Replace a uPVC Door Lock Mechanism A uPVC door that won't close or lock can be an extremely dangerous issue. It can compromise the security of your home. Contact a locksmith immediately. They'll have the tools and expertise necessary to solve the issue without risking security. A locksmith can realign the mechanism if it is misaligned because of weather changes. This can involve taking the lock apart and reassembling the parts to acceptable tolerances. Cost of the new lock The uPVC lock mechanism