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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 issues with composite doors result from a malfunctioning mechanism that can be fixed without having to replace the door. A locked that is sticky is a common issue that is caused by difficult to insert or turn the key. This can be easily resolved by lubricating the internal mechanisms of your door lock. Warped Doors Co