Alan has a remarkable method there for that pattern. It got me thinking whether or not others tie parachutes as I do. This in no way is meant to suggest that what I am explaining is of any importance, but it just might make tying parachutes easier for others.
I tie the body. Then, make a loop over the gallows tool. I tie the stem of the hackle at the base of the thread loop. I finish the body. Then, I wrap the hackle around the thread loop and tie the hackle off at the eye.
Then, I cut the top of the loop thread so that it forms two threads. I then just tie either an overhand knot tied down at the hackle or a slip know and tighten it down on the top of the hackle.
Because it is tying thread, it is not even noticeable and very light.
Just thought I would mention this method in case it makes tying easier for others.