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Recognising the Signs That it is Time to Replace a uPVC Door Lock Mechanism Changing your uPVC door lock mechanism doesn't have to be a nightmare. It's just a matter of recognizing the signs that it is time to replace it. The first step is to determine the uPVC multipoint lock's manufacturer. This information is available by examining the lock's faceplate. You can then purchase one that matches the old one. Check the Alignment of the Hinges A door lock made of plastic that is not properly aligned might