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How to Replace a uPVC Door Lock Mechanism A door lock made of uPVC which isn't able to close or lock could be a huge problem and can compromise the security of your home. Call a locksmith right away. They'll have the right tools and expertise to resolve the problem without risking your security. A locksmith can realign the mechanism if it is misaligned as a result of changes in weather. This could involve removing the lock and relocating the components to a level that is within acceptable tolerances. Cos