Slide the copper bead onto the jig hook, seat it behind the eye, and start the tan thread. Add a few wraps of lead behind the bead for extra weight if desired.
At the bend, tie in a gray/brown mini barred marabou tail about a shank length long plus a few strands of UV Krystal Flash. The marabou gives the signature pulsing movement.
Tie in the copper wire and a natural ginger saddle hackle at the tail.
Dub a buggy gray/brown Senyo's Dirty Bird body forward to about the 80% point.
Palmer the ginger hackle forward over the body, then counter-rib with the copper wire in 4-5 turns to lock it and tie off.
Dub a fluorescent-orange trilobal collar behind the bead as a hot-spot/head, whip finish. The mottled body plus orange collar shines in tannin-stained water.