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How to Replace a uPVC Door Lock Mechanism A uPVC lock that doesn't lock or close can be an extremely dangerous issue. It can compromise the security of your home. This is why you must contact a locksmith right away. They'll have the right tools and know-how to solve the problem without compromising your security. A locksmith may also adjust the mechanism if it has been misaligned due to weather changes. This may require disassembling the lock and moving the components to acceptable tolerances. Cost of rep