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Buy a can of Kano Silikroil and you will never waste time on another rusty fastener.
Hold two of your fingers in a 'V' formation. That is the coil before reversing. Now cross your fingers. That is the coil after reversing. Reversing causes the coils, which were laying side-by-side, to be crossed backwards from the way they were coiled. This makes the coil stay much tighter. All manufactured coiled cords have this done as well.
Check out an ap called Presence. It's free and I know it runs on an iPhone 4. It does either camera and I think it can control the light.