A method of attaching a leader to a snelled fly by connecting a loop bearing a bead at the end of a leader to a snell loop at the end of a leader is disclosed. Generally the snell loop is first slipped over the beaded bead loop. Then, a length of the snell monofilament line is pulled through the bead loop. The snell loop and bead loop are simultaneously pulled in opposing directions forming a bead loop knot with said bead resting on one side of the knot. The process of detaching said knot is a simple reversal of the attachment process. The present method avoids the need of cutting a snell loop to replace a fishing fly and makes it possible to easily untie a loop-to-loop knot and avoid damaging a snell.