I have a story. Back in the late eighties I went to a karate tournament given primarily by Robert Triases organization. It took place in Shaumberg Illinois in a hotel near the woodfield mall. An instructor was demonstrating cutting with the japanese sword. He had three cutting targets, one to the front and one to each side. He cuts the first target and sheaths his sword. He turned to his right, drew the weapon and cut the second target. As he cuts, the sword comes out of the hilt and flies two rings away, they had been cleared for the demo, hits the carpet, stands upright and then fell to the carpet. Needless to say it was quite the sight. Was anyone out there also there when this happened. It was primarily an okinawan tournament. If you saw the sword fly out you would remember it. Let me know.