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UPVC Door Lock Replacement UPVC doors are a great deterrent to break-ins. However they do have some limitations that can be fixed by installing a deadlock. It may be time to replace the lock's barrel if your uPVC door lock is loose. This easy DIY project will enhance the security of your home and enhance its appearance. The old lock cylinder must be removed. If you're noticing that your front door feels fragile when you lock it or your key struggles to turn, you may have a damaged lock cylinder. It will i