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Recognising the Signs That it is Time to Replace a uPVC Door Lock Mechanism The replacement of your uPVC door lock mechanism need not be difficult. It is crucial to be aware of the indicators that suggest that it's time to replace the door lock mechanism with uPVC. The first step is to determine your uPVC multipoint lock's manufacturer. This information can be retrieved by looking at the lock's faceplate. You can then get an alternative lock that is compatible with your old one. Verify the Alignment