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Replacement Lock For Composite Door If your key won't turn inside your door made of composite, it could be a problem with the gearbox or cylinder. Christopher The Locksmith recommends upgrading to a security upgrade since older locks do not have the anti-bumping, anti-drilling and anti-snap mechanisms that are now standard on new doors. Deadbolt Composite doors are a great option for any home, improving appearance and offering superior security. Like all other types of door