Top also needs to be stronger to handle the stress of the flip-top, which -- fun fact! -- starts off as a second-class lever and ends up as a first-class lever.

Top also needs to be stronger to handle the stress of the flip-top, which -- fun fact! -- starts off as a second-class lever and ends up as a first-class lever. http://crowdtube.tv/watch/pop-can-stayon-tab-slow-motion/ http://crowdtube.tv/watch/pop-can-stayon-tab-slow-motion/