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How to Replace a Replacement Upvc Door Lock Mechanism A new lock made of upvc is a great option for improving the security of your home. However, it is important to know the kind of uPVC lock you are using so that you can locate a suitable replacement. Sticking uPVC mechanisms can be caused by broken hinges within the lock or pressure that is too strong. Lubricating the hinges is a simple fix. Identifying the manufacturer The first step to replace your uPVC lock mechanism is to identify the manufacturer.