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How to Replace a uPVC Door Lock Mechanism A uPVC lock that won't close or lock is an issue. It could compromise your home's security. Call a locksmith right away. They'll have the tools and knowledge needed to solve the issue without compromising security. A locksmith can realign the mechanism if it is misaligned because of changes in weather. This could involve removing the lock and moving the parts to a level that is within acceptable tolerances. Cost of the new lock The uPVC lock mechanism is a vital