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How to Replace a Replacement Upvc Door Lock Mechanism A replacement upvc door lock mechanism can be a great method to increase the security of your property. It is essential to know the kind of uPVC door lock you are using to find 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 a simple fix. Identifying the manufacturer The first step to replacing your uPVC lock mechanism is to identify the manufactu