The way I see it with kite lines is I visit 2 forums, I read the words of other kite people then come up with my learned ideas, a friend and I mess with kites locally rarely fly together but together we pick up info from others here, I've seen 4 or 5 other people in my life flying revs or dual lines, i know wear and tear, but only make lines the way I can understand them from what I read here and there, 2 forums is good enough for me. I'll take a length of line, sleeve one end and hook it on a hook on the fence post, then pull it back, really pull it back, then I take the next piece of line and do the same, once the lines are stretched close enough for me I attach the 2 of them to my first kite a prism quantum, usually through 1 album of music, I'll take a break then make another set later, when I'm ready. Lastliy I will take the 4 lines and adjust them to length by tune of each line by plucking each of them because I'm me, I'm interested in rev kites. So here I am learning every day.