Wrap 0.015" wire on the front third of the shank - Puyans' formula is 20 minus the hook size, so eight turns on a 12. Start the Black thread, dam behind the weight, dam in front, take a few wraps over, then run back to the bend.
Stack a generous clump of Dark moose. Measure the Tail against the shank and catch it in just behind the weight, not at the bend - the same clump becomes the Wingcase and Legs.
Trim the clump by half, then thin again to eight or ten fibers for the tail. Bind back to the bend, then lift the tail and take at least one wrap underneath it so it props up - the propped tail is a signature of the AP nymphs.
Add a few thread wraps forward over the weight to lengthen the rear half so the thorax does not come out too long.
Catch in the Copper wire for the Rib.
Wax the thread well and dub a three-inch noodle of Beaver, dyed black for the rear body.
Rib forward with four or five turns of wire in the same direction as the dubbing, bind off with a couple of tight wraps in front of the weight, and helicopter the wire off. Add a tiny drop of cement here, as the original instructions call for, and lock with extra wraps.
Dub a thicker, longer noodle of Beaver dubbing for the Thorax - add more if the first pass is not enough.
Pull the remaining moose fibers over the thorax as the Wingcase and bind with three or four wraps, tight but not so tight the moose snaps.
Split three fibers to each side and sweep them back as Legs, locking with more wraps. Snip the front stubs in several small snips rather than one cut, and smooth with thread.
Put a tiny drop of cement at the head, then dub a scosh of beaver - a third of what you think - on about an inch and a half of thread and wrap a small dubbed head without crowding the eye.
Whip finish behind the eye, then trim the legs to about midway down the body, just past the thorax. Snip any stray guard hairs.