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Recognising the Signs That it is Time to Replace a uPVC Door Lock Mechanism Removing your uPVC door lock mechanism need not be difficult. It is essential to identify the signs that indicate it's time to change your uPVC door lock mechanism. The first step is to determine the uPVC multipoint lock's manufacturer. This information can be found by studying the faceplate of the lock. Then you can get an alternative lock that is identical to the lock you have previously purchased. Check the alignment of the Hinges