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Replacement Lock For Composite Door If your key isn't turning in your composite door, it could be an issue with the cylinder or gearbox. Christopher The Locksmith recommends upgrading to a high-security fitment, as older locks lack the anti-bumping, anti-drilling or anti-snap features that are now standard on new doors. Deadbolt Composite doors are an excellent choice for any home. They are stylish and provide greater security. Like all other products, they are not resistant to problems that might happen f