There used to be a video that showed how to do it with any ruler (stack the binding, cut at 45 degrees, clip the corner off at about 1/4") and also showed a great trick for joining the seams (not the overlap method) but it has been removed. I'm starting to wonder if the same people who made it are the ones who created this ruler and the other video was hurting sales. Anyway, I think I have the easy angle ruler so I might give it a try.