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How to Replace a Replacement Upvc Door Lock Mechanism Having a replacement upvc door lock mechanism can be a great way to improve the security of your property. It is essential to know 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 pressure that is too strong. A simple fix is to lubricate the hinges. Identifying the Manufacturer The first step in replacing the uPVC door lock mechanism is to identify the man