Start the thread about 75-80% of the way up the shank and wrap back until it hangs even with the start of the barb.
Measure three tailing fibers about one and a half shank lengths and catch them at the bend with two or three turns, squaring them on top of the shank. Craven keeps the tail elongated but not extreme, so it collapses when a fish eats rather than levering the hook out.
Press a thumbnail up under the three fibers to separate them, then figure-8 the thread down under the near fiber, around the shank, over the middle fiber and under the far one to lock a wide three-fiber split tail.
Wrap forward over the butts to the starting point, snip the three stubs out, flatten the thread and return to the bend.
Tie in a rusty brown goose biot by its tip with the tip extending almost to the end of the abdomen, then wrap forward over the tip to a smooth taper.
Add a touch of super glue on the shank, then wrap the biot forward in long angled travel wraps to keep the body skinny, each turn covering the standing edge of the last. Tie off at the front of the underbody and trim.
Lay a little less than half a strand of white McFlylon across the shank just ahead of the biot, take two turns, pull the near side toward you and take two more turns on the opposite angle so the wraps cross in an X, then anchor both ways until the wings sit square.
Bring the thread behind the wings and tie in a badger hackle sized at least one and a half hook gaps by its bare stripped stem, outside up, inside toward the hook.
Spin a thin, long noodle of rusty brown Super Fine dubbing and start it at the front edge of the biot, figure-8 around the wings to separate them, sweep them back, dub the head area and come back to shape the thorax, finishing at the eye without building bulk.
Palmer the badger hackle forward with two or three turns to the back edge of the wings, one turn in front of them, one more turn, then tie off just behind the eye and trim.
Build just enough of a thread head to cover the stubs, whip finish and trim.
Lift both wings together and trim them a touch longer than the hackle fibers, then trim all the hackle on the bottom flush across so the fly sits flat. The dark badger stem does not show as a light stripe across the underside the way grizzly would.