That sounds... at least partially wrong? Pull tabs do not break the seal by pressing in to the can. They break the seal by pulling the lid up away from the ca

That sounds... at least partially wrong? Pull tabs do not break the seal by pressing in to the can. They break the seal by pulling the lid up away from the can, where the "swivel" point is. The tab acts as a class two lever, where the "tip" of the tab is the fulcrum. https://en.wikipedia.org/wiki/Lever#Types_of_levers https://en.wikipedia.org/wiki/Lever#Types_of_levers