The cigarette lighter outlet was never designed to be an electrical outlet the way it's commonly used today. Even so, I've yet to find a plug for charging USB devices that fits and doesn't fall out.
All plugs I know have some little metal nub in the center that practically never gets enough contact with the socket's center base, and the sides of the plug are never effective at keeping the plug pressed in well enough.
How can I make the plug stay in place? How can I easily modify the socket to make it work?
My car's socket is vertical (pointing straight up). I don't want to dismantle my car, although it would be cool to have a USB socket in the console! This must be a common problem; how do people solve it?