Flip fly upside down in vise jaws. Cut off and stack, a bundle of buck tail, hold on top of hook shank with hair tips pointing to the left (hook bend). Wing should be around 2 HSL.

Sound familiar? This is just like tying in top wing.

Note cut off length, just a little to rear of hook eye.
Cut hair to length. Make sure you do not crowd the hook eye with excess material. This will make it harder to tie off and whip finish.
Angle hair downward on your side of hook shank. Notice tie in point is now out of alignment with thread. When we make first wrap and tighten. The hair will turn and twist up on shank and it usually turns out okay. It will with practice.
Make a loose wrap of thread around hair wing butts and hook shank.
Do not tighten thread until full wrap is made. Some people will make 2 loose wraps before tightening.
With thread bobbin aligned with thread, tighten thread hard pulling bobbin in your direction. Hair will compress and want to twist up on top of hook shank. Keep thread tension tight as we make more thread wraps.
Wrap thread forward to hook eye. Keep thread tight. Do not build up thread wraps. Wrap each beside the last.
Every two wraps. you may want to tighten almost hard enough to break the thread. Wrap to eye of hook.
I love it when a plan comes together!

Now ready to Tie In Peacock WingTopping.

Lefty's Deciever