Bill, thank you for your desire to help me. The photo you are referring to is not mine. As I mentioned earlier, this forum will not allow me to post a photo...wish I could, as it would become obviously clear what I am dealing with. The tool I need definitely needs to be around 31mm in diameter. According to what I have found to be the definition of a cassette, mine is that. The locking ring rotates with the sprockets, and it is this locking ring that needs to be removed. The freewheel removal tool you are referring me to (FR-1.3), is 22.6mm in diameter. This is too small.