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Recognising the Signs That it is Time to Replace a uPVC Door Lock Mechanism It's not difficult to replace your uPVC lock mechanism. It's just a matter of recognizing the signs that it is time to replace it. You can find this information by looking at the faceplate of your uPVC lock. This information can be retrieved by looking at your lock's faceplate. Then you can get a replacement that matches the lock you have previously purchased. Check the alignment of the Hinges Unaligned upvc door locks may not be a