Slide the propeller onto the hook first, then the bead behind it, and mount the hook.
Build a small bump of thread behind the bead for it to sit on, then take wraps behind the bead and a few figure-eights over it to lock it in place. It should sit slightly behind the propeller. Check that the propeller still spins freely before going any further.
Take the thread back to the bend and tie in a small clump of red saddle hackle fibers as the tail. Trim the butts.
Rib: double a strand of black floss over so you are wrapping two strands, and tie it in at the tail.
Body: tie in the medium yellow chenille at the tail, take the thread forward to about the 2/3 point (not all the way to the bead. You need room for a lot of hackle) and wrap the chenille forward in touching turns. Tie off and trim.
Counter-wrap the doubled black floss forward in even open turns so the ribbing sits on top of the chenille rather than sinking into the grooves. Tie it off, tidy any stray floss fibers and trim.
Take a few extra thread wraps to make a clean base, then tie in the brown dry fly hackle at the front of the body.
Palmer six to eight turns of hackle forward to just behind the bead, tie it off and trim. Check one more time that the propeller spins free.
Take a couple of locking wraps behind the bead and whip finish, leaving the propeller clear to spin.