Lash a pair of silver bead-chain eyes on top of the shank two eye-widths behind the eye with tight figure-eight wraps, up top so the fly rides point-up and hops along the bottom.
At the bend, tie in a long tail of orange calf tail, a full 1 to 1.5 shank lengths. The streaming tail is the 'comet' this fly is named for.
Tie in the silver diamond braid and wrap a smooth body forward to just behind the eyes.
Tie in one orange and one yellow hackle together and take 2-3 turns of each as a collar, sweeping the fibers back.
Figure-eight the thread through the bead chain, build a small head, whip finish, and cement.