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Replacement Lock For Composite Door If your key won't turn in your Composite door then it could be an issue with the cylinder or gearbox. Christopher The Locksmith would recommend upgrading to a security lock as older models do not come with anti-drill, bump, or anti-snap functions that are now standard in new doors. Deadbolt Composite doors are a fantastic option for any home, improving appearance and providing superior security. However, like anything else they are not immune to issues that can arise from