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A Faulty Composite Door Replacement Lock Can Increase Your Energy Bills If the mechanism in your composite door is damaged, it can make it difficult to close and lock. This could compromise your home's security and increase the energy cost. Luckily fixing a lock made of composite is a quick and easy process. It can be fixed in a couple of simple steps, and will save you the expense of replacing your composite doors. Repairing a Cylinder that is damaged Composite do