I wanted to report back to let everyone know how i solved the problem with the center triangles: I used a chalk wheel to mark the very center of the middle strip..next I chalked a line from each diagnal corner making sure all intersections crossed in the same spot on the middle line. Then I situated my ruler so that I cut right ON those lines. If you cut just next to the lines, your triangles will be off. Even with marking the lines, you may still be off a little bit. I know most people wouldn't mind being off some but I found doing this prevents you from being off by more than a skoche. I will definitely watch my pressing next time bc i think thats very important to the success with this one. In fact, cutting and pressing accurately is probably more important than keeping a perfect 1/4" seam. Technically I should've been able to slice from corner to corner but that was not the case. Maybe my experience will help someone else. I hope so!!