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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 is essential to identify the signs that indicate that it's time to replace the door lock mechanism with uPVC. The first step is to identify your uPVC multipoint lock's manufacturer. This information can be retrieved by examining the lock's faceplate. Then, you can purchase one that matches the old one. Check the Alignment of the Hinges Unaligned door locks made of upvc may not close