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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 would recommend upgrading to a high-security fitment as older locks don't have the anti-drill, bump or anti-snap features which are now standard on new doors. Deadbolt Composite doors are a great choice for any home, improving appearance and ensuring security. Like all other types of doors, they aren't immune to issues that could be enc