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Replacement Lock For Composite Door If your key won't turn inside your door made of composite, it could be an issue with the cylinder or gearbox. Christopher The Locksmith recommends upgrading to a high-security fitment, as older locks lack the anti-bumping, anti-drilling and anti-snap mechanisms that are now standard on new doors. Deadbolt Composite doors are a fantastic option for any home. They enhance appearance and provide greater security. However, like anything else they aren't immune to issues that can arise from time-to-time. A malfunctioni