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Replacement Lock For Composite Door If your key will not rotate in your Composite Door, it could be that the gearbox or cylinder is not working properly. Christopher The Locksmith would recommend upgrading to a security fitment as older locks do not have the anti-drill, bump, or anti-snap functions that are now standard on modern doors. Deadbolt Composite doors are a great choice for any home, improving appearance and offering superior security. Like all other types of doors, they aren't resistant to problems that might be encountered from time to t