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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 hassle. It's just a matter of recognizing the signs that it's time to replace it. The first step is to determine the uPVC multipoint lock's manufacturer. can determine this information by studying the faceplate of the lock. You can then get the replacement lock that matches the lock you have previously. Check the Alignment of the Hinges A door lock made of upvc that is