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How to Replace a uPVC Door Lock Mechanism A uPVC lock that won't close or lock can be an issue. It could compromise your home's security. Call a locksmith right away. They will have all the tools and expertise necessary to fix the problem without any compromise to security. A locksmith can realign the mechanism if it has become misaligned because of changes in weather. This may require disassembling the lock and moving the components to a level that is within acceptable tolerances. Cost of a new lock T