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How to Replace a Replacement Upvc Door Lock Mechanism Having a replacement door lock made of upvc can be a great way to improve the security of your home. However, it is important to identify the type of uPVC lock you have in order that you can find the right replacement. Broken hinges or pressure can cause uPVC mechanisms to become stuck. A simple solution is to grease the hinges. Identifying the manufacturer The first step in replacing your uPVC door lock mechanism is to identify the manufacturer