You’re on the River swinging flies and come to a run with a deep, swift pool. None of the flies you’re carrying will get to the depth you want. What do you do? Carry a variety in worm weights, those little lead heads with a hole through the middle. Slip one on your leader, attach your fly and you have an instant weighted fly! Plus you can easily change weights, from 1/16 oz to 1/4 oz. Simple, quick and effective.