Tend to agree- looks like an handle that locks into the tool. Look around the garage for the tool partI would like to see a photo of the bottom and the length of this tool also. Here's what I'm thinking: In the photo the position of the tool would be correct. The taller piece on the left would be for gripping the tool and the smaller, sort of hooked piece, would be for placing the thumb of the other hand to help push. That look's much like a tool that is used to mount a auto body file/rasp to it. That's why I want to see if the bottom of this tool has provisions for some type of screws/bolts, etc.