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How to Replace a Replacement Upvc Door Lock Mechanism A new lock made of upvc is a great way of improving the security of your home. It is crucial to determine the kind of uPVC door lock you have in order to find a replacement. Sticking uPVC mechanisms could be caused by broken hinges inside the lock or by pressure that is too high. Lubricating the hinges is an easy fix. Identifying the manufacturer The first step in replacing your uPVC door lock mechanism is to identify the manufacturer. This can be done