This is the fly rod addicts' answer to the soft plastic worm for bass fishing. Flies don't come much simpler than this one. Wrap a foundation, add any lead desired to the hook for weighting and a weed guard (stainless or monofilament), tie on the zonker strip at the bend and wrap forward to the eye with a fresh coat of cement on the foundation. Finish with a wrap knot. It's so easy, I'm skipping the detailed tying instructions on this one. Any wet fly hook in the 2-6 range will do. Just make sure that the point is sharp and that the strip is balanced to the shank to avoid tippet twist. Make up a variety of color and weight added models for different applications on the water.
Fishing this fly takes a heavy rig, 8 weight or greater, with a 15 lb or heavier tippet. It's not very wind resistant, but it is heavy when wetted. But it's a great fly for catching bass, working as well, if not better, as a plastic worm. How the fly is fished depends mostly on the weight added to the shank. Unweighted worms are used near the surface to poke around stumps and weed lines and breaks. Drop one of these into a pocket in the weeds and watch out. The heavier weighted flies are cast to stumps and stick up and channel breaks and allowed to sink, then they're retrieved ever so slowly along the bottom. Give the rabbit hair a chance to do its job on the fish, which it definitely will.
One note: Stay in contact with the fly as much as possible and watch the line for the slightest motion. A fly rod is not a worming rod, and the sense of touch that makes worming so effective must be transferred to visual clues. If in doubt, set the hook with a quick pop of the line. Don't rear back on the rod like a worm rod. A small hump in the line is all that is needed to transfer the necessary hook setting pressure with fly hooks. Feel for a take up in the line, and if it's felt, put the pressure on the fish quickly. It's a little different than worming, but it's just as effective, once the routine is perfected.
Dry the fly thoroughly before returning to the fly box to help precent general hook rusting.