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How to Replace a uPVC Door Lock Mechanism A uPVC lock that doesn't close or lock is an extremely dangerous issue. It could compromise the security of your home. Call a locksmith right away. They'll have the tools and expertise to resolve the problem without compromising your security. A locksmith can realign the mechanism if it is 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 lock replac