Start the rusty-brown thread and run a smooth base to the bend.
Split-tie the Microfibett tails: two or three fibers to each side, spread in a wide V about one shank length long, using a small dubbing ball at the bend to splay them.
Tie in a rusty-brown goose biot by its tip at the bend and wind it forward in touching turns to the thorax to form a segmented abdomen; tie off and trim.
At the thorax, tie in a clump of white McFlylon across the hook and figure-eight it into spent (flat) spinner wings; leave a small upright tuft as the hi-vis post so you can see the low-floating fly.
Tie in the grizzly hackle by the stem at the wing base.
Dub a slim rusty-brown Superfine thorax around the wing base.
Wind the grizzly hackle 3-5 turns through the thorax and over the wing base (a palmered thorax hackle adds float and visibility to this flush-floating spinner), tie off and clip. Whip finish and cement. The white wings and post keep this flat-in-the-film pattern trackable in flat water.
Trim the hackle flat underneath if you want it to sit lower in the surface film.