Slide the black tungsten bead onto the hook, start black thread just behind the bead, and trim the tag.
Jam a tiny amount of dubbing into the back of the bead hole to lock the bead tight against the eye.
Tie in a strand of black Krystal Flash underneath the shank for the rib and let it hang off the back.
Tie in a strand of light-green translucent Krystal Flash and wind it in touching turns back into the bend and then forward again to the starting point, building a slim translucent abdomen (the torque keeps the black rib on the underside).
Tie off the abdomen material.
Wind the black Krystal Flash rib forward in even open turns to form the rib and tie off.
Do a three-turn whip finish to secure everything, then apply a thin coat of clear varnish over the abdomen and let it dry.
Spin a very small amount of SLF Prism peacock dubbing onto the thread and form the thorax with a second whip finish so no band of thread shows, completing the fly.