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