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Replacement Lock For Composite Door If your key will not turn in your Composite Door, it could mean that the gearbox or cylinder is defective. Christopher The Locksmith recommends upgrading to a high-security fitment since older locks do not have the anti-bumping, anti-drilling or anti-snap devices that are now standard on modern doors. Deadbolt Composite doors are an excellent choice for any home. They improve appearance and offer superior security. Like all other products they aren't immune to problems