I've seen these mention before in various places including the California cop light thread. But I've never come across one in real life and I'm curious about them. What was it that made them this way? Like what engineering shortfall required you to hit them to make them work? Any light that I've ever seen, it has batteries in it and they're held in place with springs. I can't see how hitting a light can make it work. So I'm curious about some examples of these. Plus I think vintage lights are cool and want to see your pictures of them