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UPVC Door Lock Replacement UPVC doors are an excellent security measure against burglaries. They do have some limitations, but they can be overcome by installing deadlocks. It could be time to replace the barrel lock if you feel that your uPVC door lock feels a bit loose. This easy DIY project will increase the security of your home and enhance its appearance. Take off the lock cylinder that was in the old lock. You may have a damaged lock-cylinder if you notice that your front door is weak or the k