I met the lady who "invented" it several years ago. It looked easy when she did it. I just received the one I bought off Ebay today. I know there is a pretty good tutorial on line because I have watched it.
I hope to use it here real soon as I'm finishing up a donkey quilt for my grandson.
I think I paid about $6.00 including shipping for it. They had several left to sell when I bought mine. Just type in "Aunt Becky", that's how I found mine.