Oh, so if you're on a small enough cog, the tip of the tool will kind of pinch the last loose link of chain in place? I was thinking you were saying standard chain whips have an attachment point where you can/should physically attach the end of the chain. That would be a good invention, and could be hacked pretty easily just by drilling a hole, and maybe even like a paperclip could go through the last chain link and the hole just enough to keep it together