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How to Replace a Replacement Upvc Door Lock Mechanism A new upvc lock mechanism is a great option for increasing the security of your home. It is important to identify the type of uPVC door lock you have in order to locate a replacement. Broken hinges or pressure can cause uPVC mechanisms to become stuck. A simple solution is to grease the hinges. Identifying the manufacturer The first step in replacing the uPVC door lock mechanism is to identify the manufacturer. This can be done by looking at the lock and