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How to Replace a uPVC Door Lock Mechanism A door lock made of uPVC which will not close or lock can be a huge problem and can compromise the security of your home. This is why you should contact a locksmith right away. They'll have the tools and expertise to resolve the problem without jeopardizing your security. A locksmith can re-align the mechanism if it is misaligned as a result of weather changes. This may involve disassembling the lock and relocating the components to allow for tolerances. Cos