Hey folks! Hope someone knows about this. Have used these old changers before but only with crow bars, leaf springs etc. This one came with the original tire tool. It's obvious what the two different ends are for and with a little soap and effort it will peel a casing off in seconds. However on one end of the tool there's a projection about 8 inches long and big as your little finger, hinged with a single pin. Not a real heavy setup but obviously good for something as its worn smooth from use. Anybody tell me what it's for and how to use it???