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UPVC Door Lock Replacement UPVC doors are a great deterrent against break-ins. They do have their limitations, but these can be overcome by installing a deadlock. If your uPVC front door lock feels loose or sloppy, it might be time to replace the barrel lock. This simple DIY project can improve your home's security and enhance its appearance. Removal of the old lock cylinder It is possible that you have a damaged lock-cylinder when you notice that your front door feels flimsy or the key struggles to tur