Como hacer el nudo mariposa en la katana o iaito

The butterfly knot is the one that comes with a katana or iaito when we buy it. It's the most traditional type, and we often don't want to undo it because it's so pretty and we think we'll never be able to tie it again. However, this knot is quite simple to make; it only takes five minutes to complete. In this video, Professor Luis Monzón teaches us how to tie this knot.