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Replacement Lock For Composite Door If your key won't turn in your Composite door then it could be a problem with the gearbox or cylinder. Christopher The Locksmith would recommend upgrading to a security lock as older models do not come with anti-drilling, bumping or anti-snap functions that are now standard on modern doors. Deadbolt Composite doors are a great option for any home. They are stylish and provide superior security. But, as with all things they aren't immune to problems that could a