I might have that tool if it looks like an A when opened up and is just a hinged pair of square steel tubes. They are extremely hard to use and set. I don't know if mine came with any instructions. The problem I find with it is that when you try to fine tune it it changes both ends instead of just the open end. It also doesn't have much of a hook on the end the keep it engaged with the work piece. For that reason I just attached some stops to a piece of plywood last time I needed to taper something instead of using that taper jig. I'm glad you posted this. I was planning on giving it away in the local buy and sell to free up wall space and had forgotten about it.