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Composite Door Lock Replacement Composite doors provide a high degree of security that will ensure that your family and friends safe from intruders. However, as with all doors they are susceptible to warping or expanding in time, which can cause problems with the locking mechanism. A common issue is when the lock on the cylinder becomes sticky. This is usually caused by the lock being improperly lubricated. A Locksmith can service, repair and replace the door cylinder