Can’t you plug tube-type flats?
OK, I know it doesn't work, but WHY can't you plug tube-type flats? Intuitively, it seems like the plug would simply stop-up both the tube and the tire. The tube can't be moving around that much, can it? Maybe only a mushroom-head plug would work?
Does anybody know exactly why it can't be used? At least for a few miles, to get to a shop or home.