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UPVC Door Lock Replacement UPVC doors are an effective deterrent against break-ins. However, they do have limitations that can be overcome by installing a deadlock. to change the barrel lock if your uPVC door lock is loose. This simple DIY project will enhance the security of your home as well as improve its appearance. Remove the old lock cylinder If you're finding that your front door is weak when you lock it or that the key is struggling to turn, you could have a damaged lock cylinder. It will impro