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UPVC Door Lock Replacement UPVC doors are an effective protection against burglaries. However they do have some limitations that can be fixed by installing deadlocks. If your uPVC front door lock feels loose or sloppy, it could be time to change the lock's barrel. This simple DIY project can enhance the security of your home as well as improve its appearance. Take off the lock cylinder that was in the old lock. You could have a damaged lock-cylinder if you notice that your front door feels weak