"Tom / Rusty, On a point that bigkahuna mentions one item that would be good on any osd or gui would be a turns counter, so the operator knows how many clockwise or anti-clockwise turns have been carried out so that they can undo the turns before…"

"Hi Tom / Rusty,
 
I guess you are talking tether strain relief, you could also use a prussick knot setup with a small dia dyneema rope & bridle to the frame.
 
regards
 
John  "