When a mayfly sheds its nymphal shuck, there is a moment of vulnerability as the fly struggles in the surface film. Sometimes the bug gets stuck and it floats downstream, a potential bit of protein for a waiting trout.
Wilcox’s Hanging Chad (aka Dingle Berry) utilizes a clever device, a second de-hooked shank upon which the tail wiggles back and forth. The legs and tail are made of rubber, and the parachute hackle keeps the bug riding low.
Tie both sections of this fly on No. 12-16 dry fly hooks. Use ostrich herl, olive tubing and rubber legs for the trailing shuck. On the front hook, tie mono to attach the second hook and build the body with olive tubing. For the wing, use calf tail and add a parachute-style hackle. Dub the thorax with olive Antron and add rubber legs.
— Gary Lewis, For The Bulletin