If they're tying it to the end of the line, they're probably using the improved clinch knot, which has visually similar wrapping: http://www.netknots.com/fishin

If they're tying it to the end of the line, they're probably using the improved clinch knot, which has visually similar wrapping: http://www.netknots.com/fishing_knots/improved-clinch-knot/ http://www.netknots.com/fishing_knots/improved-clinch-knot/