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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's as simple as 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 looking at the lock's faceplate. Then, you can purchase a replacement lock that matches your old one. Check the Alignment of the Hinges Unaligned Upvc door locks might not close correctly. This is often caused