Nothing too special here. The black marabou tail is cut a bit longer than shank length. I place the butt ends about mid shank and tie them down securely. I then wrap/rib the thread back toward the bend while securing the marabou fibers atop the shank. At the bend the thread wraps stop while  I then tie a very few holigraphic strips for a bit of flash. I then wrap back toward the thorax region, being careful to try and wrap back over my previous wraps. At the thorax area I wrap one to two turns of sparkle chenille and secure the thread head right behind the rootbeer brown Dazzle Bead (Hareline). This would be an undulating, barely weighted Leech pattern. Out of the water the marabou slicks back, but in the water the material pulses in an undulating manner.