Where do you add the 1 1/2? Sounds weird, but I cut a bunch of extra 2 1/2 inch squares and would like to cut the 1/4 triangles from those. I also have a lot of HSTs. How would I cut those down? If I make a template out of the size I need, can I just add 1/4"? I don't need that many - 10 or 12 at the most. The rest are HSTs and already cut