Hey Jock Scott,
I have been tying the Madsen's Barber Pole for a few years now. I learned to tie this fly from Jerry Regan. Jerry usually ties the parachute version but the original is traditionally hackled. Anyway, here is the recipe
Hook: Mustad 94831 usually size 8 10 12.
Thread: Danville 3/0 monochord yellow
Tail: Grey squirrel not sparse.
Body: Light Yellow polypropylene floating yarn (Wapsi, Phentex, etc)
Ribbing: Maroon embroidery floss (Jerry is very specific about the color. This stuff has a numbered color code, I'll check my skein later)
Wing Post: Deer belly hair from an old doe shot during archery season (This is actually important). The post should be tied in like a fan with a slim profile looking at it from the front.
Hackle: Dark brown and grizzly like an adams. I like hackle a size or 2 too big for this fly.
This picture is the parachute version which I have tied. It is exactly the same materials that Jerry uses, but his looks a little better. That fan wing he achieves with deer hair is tough.
I'll try to find some of the traditionally hackled versions or tie some and post a picture later.
I really love those old Au Sable flies. They are very distinctive and not very well known outside of Michigan. I'm pretty sure that Jerry Regan is the only commercial tyer that still ties the Madsen's Barber Pole.