Start brown UTC thread on the D410 and tie in a sparse, splayed Coq de Leon tail at the bend. On a spinner the tail is a float point, so keep the barbs stiff and well separated.
Tie in a hand stripped peacock quill by the tip and wrap it forward in touching turns to the 65% mark. Stripped quill gives the fine natural segmentation that a spinner body needs, and it stays slim where dubbing would not.
Coat the quill body with a thin layer of varnish or UV resin if you want it to survive more than a few fish. Stripped quill is beautiful and fragile in equal measure.
Tie in natural grey CDC as spent wings, one bunch out each side, flat to the water at ninety degrees to the shank. Flat wings are the entire silhouette of a dead spinner and the only thing a fish sees from below.
Dub a small rusty squirrel thorax over the wing roots to lock them in the spent position, then whip finish.
Fish it dead drift in flat water during a spinner fall, when trout are picking off dead and dying mayflies in the film.