I’ve been wondering about this too since I’m about to re-string my MLD flat tarp. Anybody have great suggestions? I’m particularly interested in finding out an easy way to keep the guylines from tangling when I pack my tarp into its stuff sack.
But for the moment, I have a few tentative pointers.
1) The MYOG article you referenced looks pretty good. If you want to use that method to make a loop, I would suggest making the loop unattached to anything, and then girth-hitching the line to your tarp. That way you’ll be able to easily remove the line from your tarp if you want to experiment with some other arrangement.
2) If it were me, since I haven’t tried Jim’s method, I would probably just do a bowline to make a loop instead. Don’t need a sewing needle to do it, at least.
3) As for the other end of the line, where it hooks up with the stake, you almost certainly want this to be adjustable, so that you can A) allow your tarp to be pitched in tight or uneven spaces, and B) properly adjust the tension of your tarp once it’s pitched, or once the weather changes. There is a tensioner kit that BPL sells, but if you don’t have time to wait for the shipping or don’t want to bother with more hardware, I’ve had good experience using a taut-line hitch looped back onto the guyline after it has looped around a tent stake. This is free, fun to learn, doesn’t require any other equipment, and is a really valuable knot, if you haven’t learned it already. I haven’t seen TripTease up close but I must warn that this knot might not work if you’re using something slick like spectra. But then . . . I’m pretty sure TripTease has a lot of friction in it–I hope the knot slides at all!
Hope this stuff helps, good luck!