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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 big problem and could compromise the security of your home. Contact a locksmith immediately. They'll have the tools and experience to solve the issue without risking your security. A locksmith can also realign the mechanism if it is not aligned due to weather conditions. This could be done by taking the lock apart and moving the components back to their proper tolerances. Cost of the new lock A uPVC