The willow stone, well, Its not quite mastered yet. Some versions have been quite effective, but I don't just design for effectiveness. I want the fly to be durable as well. I don't want to have change flies because it is coming apart. So after putting the most recent version to test, I decided it needed a redesigning. Mainly the wing, but I also am playing around with different materials for the stripe. The version below I like a lot. I will be putting it to the test this week.