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How to Replace a Replacement Upvc Door Lock Mechanism Installing a new upvc door lock mechanism can be a great option to increase the security of your property. But, it is essential to know what type of uPVC lock you are using so that you can find an appropriate replacement. Broken hinges or excessive pressure can cause uPVC mechanisms to become stuck. Lubricating the hinges is a simple fix. Identifying the Manufacturer The first step to replacing the uPVC lock mechanism is to identify the manufacturer.