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How to Replace a uPVC Door Lock Mechanism A door lock made of uPVC that isn't able to close or lock could be a huge problem and compromises the security of your home. Get a locksmith in touch immediately. They'll have all the tools and knowledge needed to resolve the issue without any compromise to security. A locksmith can re-align the mechanism in case it is misaligned as a result of weather changes. This may require disassembling the lock and moving the parts to acceptable tolerances. Cost of the new l