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How to Fix a Composite Door Replacement Lock Many homes are fitted with composite doors for their attractive good looks, improved security and insulating properties. The majority of problems with composite doors result from a malfunctioning mechanism that can be fixed without replacing the door. A sticky lock is a common issue that is caused by difficult to insert or turn the key. It is possible to fix this problem by lubricating your door lock's internal mechanisms. Warped Doors Composite doors are incre