Juliet, you can use any 45 degree ruler to make this. The binding tool is just a convenient size for making it the right length.
How long is the binding tool? I already can join my binding strips so I've never bought the tool, but would like to make this. I'm sure I could figure it out or adjust the size to alter the overall pattern size. Just curious.
~Louise
What do we live for, if it is not to make life less difficult for each other?
George Eliot