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Recognising the Signs That it is Time to Replace a uPVC Door Lock Mechanism It's easy to replace your uPVC lock mechanism. It simply requires recognising the signs that it's time to replace it. The first step is to identify your uPVC multipoint lock's manufacturer. This information is available by examining the lock's faceplate. Then, you can purchase the replacement lock that matches the lock you have previously. Check the Alignment of the Hinges Unaligned door locks made of upvc may not close correctl