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How to Replace a Replacement Upvc Door Lock Mechanism A new upvc lock mechanism is a great way of increasing the security of your home. It is important to identify the kind of uPVC door lock you have in order to locate an alternative. Sticking uPVC mechanisms can 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 to replace the uPVC door lock mechanism is to identify the manufacturer. You can do this