The pattern is a heavily weighted and meant for lobbing and dredging on a short, controlled drift..ala Czech Nymphing. The fly possesses all the weight required to sink to the bottom of any deep drift. I did not weight the hook, but instead bought hooks with molded lead (they come with titanium also, I believe). Such hooks are available in Europe and the U.S. You could try wrapping lead and concocting your own. I found the hooks at one of those yearly outdoor shows via Fly Tying Specialties.
I tied a few patterns with the weighted hooks. Of note are the bodies made of wrapped latex rubber strips and the dubbed thorax with dark deer hair. Jeff Morgan, an excellent tier, first showed me the dubbed deer hair thorax. I seldom see it used. The pieces of cut deer hair can be twisted onto the thread (not easy) or placed between the dubbing loop and spun (easier). Don’t over do the amount of deer hair. A dark permanent marker was used to touch up the thorax area to give a two tone appearance.
The above hook was covered with a fly pattern but I cut it away to expose the weighted underbody. I knicked the rear a bit with the scissors. Below are a few of the flies I tied using this style of weighted hook.
My lighting was off for these pics. So not as crisp as I would have liked….but you get the idea and I think see the value of the deer hair thorax.