Here is my Instructible on the making of Bo-Shuriken. Traditionally, they were made of anything readily available; nails, needles, or rods of metal. I'll be showing you how to make them out of nails.
Materials are as follows:
Bench or angle grinder.
Cup of water.
Propane torch(or other gas).
If you like to hear things, wear earplugs
Step 1: Cut Off the Head
Step 2: Sharpen the Tip
Step 3: Harden the Tip
Using the pliers, stick the tip of the nail into the flame. Hold it there until it is a bright orange color. Immediately stick the tip into the water and pull it back out again. Do this over and over again until it stops hissing.
Step 4: Blacken the Whole Thing
Step 5: Throwing Your Toy
First off, NO throwing at animals, private property, or little brothers. PERIOD! It is hard to properly explain the movements needed for throwing bo-shuriken. The best I can do is say that you move your hand like you are karate choping the air. See the pictures for help. if you still need help, go to www.secrets-of-shuriken.com.au. If you need a target, tape 3 or 4 layers of cardboard together and paint or draw a target symbol on the cardboard. Or if you have an ugly old shed you could throw at that. Now go toss that toy!