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When to Replace uPVC Door Locks If your upvc lock is not locking or closing correctly it could be time to replace it. Look for the name of the manufacturer on the faceplate of your lock to determine the type of lock you have. Locksmiths are able to easily change the lock made of upvc and ensure the security of your home. But, it is crucial to have the key measurements on hand, including the screw-to-spindle dimension and the PZ distance. Cost Many reasons may be the reason for having to replace uPVC