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Replacement Lock For Composite Door If your key isn't turning in your Composite door then it could be an issue with the gearbox or cylinder. Christopher The Locksmith would recommend upgrading to a high security fitment as older locks do not come with anti-drill, bump or anti-snap features which are now standard on modern doors. Deadbolt Composite doors are an excellent choice for any house, enhancing appearance and providing superior security. Like all other products they aren't resistant to problem