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How to Replace a uPVC Door Lock Mechanism A uPVC door that won't close or lock can be a serious problem. It could compromise your home's security. Call a locksmith right away. They will have the right tools and expertise to resolve the issue without jeopardizing your security. A locksmith may also adjust the mechanism in case it is misaligned due to weather changes. This may require disassembling the lock and relocating the components to acceptable tolerances. Cost of the new lock The uPVC lock mechanism