Check out Dave Mead bows if you want to see knife blade siyahs Arvin. He has a web site on utube if that is what you are referring to. He seems to be able to line every thing up straight,and the siyahs are pretty long, and sharply angled. Akin to mongol bows.With 2 bamboo slats ,and a wood handle, and watching him shoot some through a chrony he seems to get good speeds. You may talking about a regular recurve though. Not sure.