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Replacement Lock For Composite Door If your key will not rotate 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 and anti-snap mechanisms that are now standard on new doors. are an excellent option for any home. They are stylish and provide superior security. However, like anything else they aren't immune to issues that can arise from time-