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How to Replace a uPVC Door Lock Mechanism A door lock made of uPVC that won't close or lock can be a huge problem and can compromise the security of your home. This is the reason you should call a locksmith immediately. They'll have the tools and know-how to solve the problem without risking your security. A locksmith can also realign the mechanism if it is not aligned due to weather conditions. This can involve taking the lock apart and moving the components back to their proper tolerances. Cost of a new