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Replacement Lock For Composite Door If your key will not turn in your Composite Door, it could mean that the cylinder or gearbox is defective. Christopher The Locksmith recommends upgrading to a high-security lock because older locks don't have the anti-bumping, anti-drilling and anti-snap mechanisms that are now standard on modern doors. Deadbolt Composite doors are a great option for any home. They improve appearance and provide greater security. Like all other types of doors they aren't resistant to