BH Leech Mohair Olive - Bead Head. To use the Olive Beadhead Mohair Leech most effectively in many popular trout lakes, a slow retrieve or a count-down-and-retrieve method should be employed. On the rivers, examples such as the Elk River or the Fraser River, diversity is the key. A variety of different retrieves is necessary to discover the one of the moment these could include: figure eight, fast, strip-and-pause, or a quick strip. The Olive Mohair Leech Bead Head is an essential for any fly fisherman's tackle box, I don't leave the house without one myself.