Furled leaders are layed out on a fixture with pegs placed at different locations . This produces a leader with a built in taper. Pegs can be added or removed to make a leader with just about any taper that you desire. With this method, there are no knots in the leader and you have a smooth taper from butt to tip.It also produces a finer, more delicate leader.
Here are a couple pictures of my board...