The Duomid from MLD has a guy tie out only on one door panel. This is a bit limiting if the wind changes direction. The remedy was to sew a linelok on the other door panel. However this meant either having two guy lines threaded (leaving one guy unattached) or unthreading and moving the guy line.
I saw some pictures of Colin Ibbotson’s MYOG shelter where he used a karabiner with a loop of grosgrain and a linelok to make a removable guying point. Ingenious, so I copied it. It took less than five minutes to sew the grosgrain loop (with kevlar thread!). Hey presto! A removable guying point that can be swapped between door panels.