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How to Fix a Composite Door Replacement Lock Many homes have composite doors fitted for their attractive good looks, improved security and insulating properties. The majority of problems with these types of doors are caused by malfunctioning mechanism, and can usually be rectified without the need to replace your composite door. A common problem is a locked that is sticky that occurs when it becomes difficult to put in or turn the key. This can be resolved by lubricating the internal mechanisms of your door lock. Warped Doors Composite doors are durable a