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How to Replace a uPVC Door Lock Mechanism A door lock made of uPVC that will not close or lock can be a huge problem and compromises the security of your home. Contact a locksmith immediately. They'll have the tools and expertise to resolve the issue without risking your security. A locksmith can also realign the mechanism if it is misaligned because of weather changes. This can require removing the lock and reassembling the parts to acceptable tolerances. Cost of the new lock The uPVC lock mechanism i