How do you make a demon wind shuriken?

The Demon Wind Shuriken, or Fuma Shuriken, is a special type of shuriken in the anime Naruto, sporting blades as large as short-sWords and the ability to collapse for storage. Many people have made non-collapsing models for this shuriken out of wood or paper, though an actual version would be made of metal. Some form of locking mechanism would be required for the demon wind shuriken to collapse like it does while still being usable.