Light Tungsten or Brass Beadhead, with a tip of the hat to The Tenkara Guides for a great pattern.
Shetland Spindrift wool bodies, Whiting Brahma Hen hackle, Shetland sheepdog collar, Barbless Klinkhamer (NOT JIG) hook. The deep fishing answer for average weight rods. Choose between a lighter tungsten bead fly that gets down deep and is easier to cast, or a brass bead for use on ultralight weight rods. On-stream, wipe it in the algae to absorb stream aroma and hide yours. Sold as three flies.
NOTE: Use caution when casting bead-heads which can break a rod tip. Choose an unweighted or under-body weighted fly if you are uncertain.
Jim, the flies have been incredible. Just got back from a 3 day fishing trip and caught over 50 rainbows and browns, with many of them between 12-18". SH in California