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Replacement Lock For Composite Door If your key won't turn on your Composite Door, it could be that the gearbox or cylinder is defective. Christopher The Locksmith would recommend upgrading to a security installation as older locks don't have the anti-drill, bump, or anti-snap features which are now standard on modern doors. Deadbolt Composite doors are a fantastic option for any home. They improve appearance and provide superior security. However, like anything else they are not immune to issues that may