Wrap the 0.020" weight over about three-quarters of the shank of the size 10 1X long nymph hook, centred on the flat part. Start the Black thread, dam it behind the weight, take it over the top, dam it in front, then bring it back to the tail position.
From an Olive grizzly hen feather (the same one used for the hackle later) pull about 15 of the longer fibres and bind them in at the rear as a tail a little longer than a hook gap. Check the length after two wraps and shorten if needed.
Use the fluff from the base of that feather to fill the step between the bare shank and the weight, then snip the mess without cutting the thread.
Catch in the Fine gold wire just behind the weight with two or three wraps.
Snip the brittle tip section off three strands of Peacock herl and bind them in at the tail. Leave the thread hanging about halfway up the shank rather than at the front. Wrap the herls forward side by side, not twisted into a rope, and as they start to spread push the hanging thread forward to keep them together. Stop just in front of the weight, leaving room for the hackle, so the body is football-shaped. Bind off and snip.
Counter-wrap the Fine gold wire forward in four to six turns purely for durability, lock it with several tight wraps, and spin it off.
Take the thread back a little. Strip the fluff from the rest of the Olive grizzly hen feather, pull the tip back to make a V notch, and bind it in by the tip with the concave side toward the hook using two or three wraps. Fold the tip back and add one or two more wraps, then snip the tip.
Wrap three turns of hackle as a soft-hackle collar, bind it off on the far side with two wraps plus one more, and snip the excess as close as you can.
Sweep the hackle back and build a good-sized nymph head from just behind the eye back over the hackle. Whip finish with four or five turns and add a drop of head cement.