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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 compromises the security of your home. This is why you must contact a locksmith as soon as possible. They'll have the equipment and know-how to solve the issue without any compromise to security. A locksmith can also realign the mechanism if it is misaligned due to weather changes. This could involve removing the lock and moving the components to allow for tolerances. Cost of