Do you know the grip changes? I only know of one, but unfortunately, its kinda tough to describe. As far as spinning, you can place your index finger between one of the Yoku (prongs) and the monouchi (blade) and spin them vertically like you might with a gun. Due to the sais weight and balance you might have difficulty. I can only do about 5 spins before losing control and having it drop on my foot. lol Also, when you spin them, make sure you hold it away from your body. People often miscalculate and have the sai hit their arm, under their arm, or catch on their clothing.