It is best at this stage to wind the thread over the lead to secure it. Take a large plume of marabou about twice the length of the hook shank and tie it on top of the hook shank to form a tail. Tie in the black chenille at the same point where you tied in the marabou. Tie in the lime green chenille and take the thread up to the eye. Wind the lime green chenille a couple of turns around to form a nice head providing a contrast to the plain black marabou.
Whip finish the head, tie off and varnish.
It can be fished on all types of line from floater through intermediate to various sinkers. Normally best responses come to a slow figure of eight retrieve with the occasional pause. It also works well with a medium strip retrieve as each pause allows the weighted fly to fall through the water so that the action of the fly is erratic. Takes, as often with marabou tailed flies, can often be felt as a series of taps and you should resist the temptation to strike at these. Just continuing the retrieve is normally enough for the trout to take the fly very confidently.