OK. I use .008 lines all the time. Here is what I do. I use 1/16" aluminum tubes about 3/8" long. I chamfer the inside edges of all the tubes with a new #11 blade. I slide shrink tube onto the lines before I start the line ending process (2 pieces of red on one, 2 of black on the other, all 4 about 3/4" long, if you slide on both pieces at once, you won't screw it up on the other end).
My usual setup is a bit different from the AMA recommendation, but the AMA one will work just fine, so use that. Set up the lines per the AMA instructions, then slip the heat shrink up over the crimped tube butted up against the eyelet and, while protecting the line itself from the heat (wet paper towel or fingers) shrink the plastic tube over the aluminum one. The plastic shrink tube will greatly reduce the end stress on the wire as you wind it in or out and fly. It makes a great reference for up and down too!
If you want to do my setup, it is once through the tube, around the eyelet, back through the tube. Then around the outside of the tube to the eyelet end and back toward the main line. Pull everything tight and do 2 crimps at the ends and one in the center 90 degrees off. Be sure you clip the correct piece of wire as you finish (you don't want to screw this up, trust me....)
The real keys are the chamfer on the tubes and the plastic shrink tube. They reduce the stress on the wire itself beyond belief.
For me, the limit is how many times my lines can stand getting stomped on.
