Start the UTC 70 olive thread behind the eye of the Daiichi 1180 and lay a good thread base back to the barb, trimming the tag.
At the barb, pick out five or six Hareline Mayfly Tails in Medium Dun, measure them about one shank length, and bind them on top of the shank; work the thread forward and snip the butts.
Fold a length of Hareline Chernobyl After-Glow Fiber in half around the thread and bind it in midway between the eye and the barb. Take a couple of tight wraps at the base, pull everything up, and figure-8 around the post so it cannot shift.
Go back to the tail and tie in one olive Hareline Turkey Biot Quill by the tip, then wrap the thread forward to build a slight taper in the underbody.
Brush a little Zap-A-Gap along the underbody with a bodkin to lock the biot down, then take the quill in hackle pliers and wrap it forward, rotating the vise, to the base of the post; tie it off there.
Size a Keough Tyer's Grade Medium Dun hackle to the fly and tie it in just behind the eye, adding a couple of securing wraps around the post to orient the feather.
Twist a very sparse pinch of Hareline Super Fine Dry Fly dubbing in Olive onto the thread and figure-8 it around the post for the thorax.
Whip finish the front of the fly — two turns is enough if you have left room — and cut the thread away.
Flip the hook in the vise so the post stands upright, start the thread on the post itself and keep the base low, then put a small drop of Zap-A-Gap on the post before the hackle goes on.
Wrap the hackle five to six turns down the post, with a couple of extra turns at the bottom, and lock it off with a few tight wraps.
Whip finish, trim the hackle tip and the waste thread, and trim the post to length — short if you like it neat, longer if you want to see it.