Prepare the quill: take a long herl from a peacock eye and strip the flue by drawing it across a rubber eraser from tip to butt (or stroke it on a damp foam pad).
Start the fine black thread and lay a base around the bend.
Tie in the stripped quill by its tip at the rear.
Wind the quill forward in touching turns with a slight taper, being gentle. It is fragile. A trace of remaining herl peeking through looks natural. Tie off at the thorax.
Optionally level a thin coat of Solarez over the quill body with a bodkin and cure it - Brent often leaves it natural for less shine. You can also counter-rib with extra-fine wire instead.
Cut a small snippet of white polypropylene yarn and tie it along the top of the thorax area with a little stub sticking out over the eye.
Roll the chopped dark Shadow Dubbing sparsely onto the thread (fibres lying along the thread, not sticking out) and wrap a small, colorful thorax with a few spiky fibres off the sides.
Lay the poly yarn loosely over the top of the thorax, do not pull it tight; let it bubble slightly, tie it down behind the eye, and clip it leaving a short stub as the wing/gills.
Tip the fly up and whip finish right behind the eye.