remember that unless you buy pre-stressed sting, I use b-50, that you're gonna get an inch or so of stretch, so be prepared to redo one end once you shoot it a bit, or wieght the plys before you twist it...i twist with the one loop knocked until the string is one hand width from the other knock. i guestimate a little extra or less so the the end of my second loop ends up at the hands width. that has always given me about 6 3/4 -7 1/4" brace height on a 68" bow when tillered to my meager ability.