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For Composite Door If your key doesn'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 installation as older locks do not have the anti-drilling, bumping or anti-snap features which are now standard in new doors. Deadbolt Composite doors are a fantastic option for any home. They enhance appearance and provide greater security. But, as with all things they are not impervious to problems that could arise f