Sorry it's been a long time since the last post,i'll try and post more often. Here's how to make a very easy very cheap but fully capable ninja star.
spray paint...or not if you just don't care
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Step 1: Cutting Corners
So get you tin snips and cut a corner off that is big enough for you to comfortably through.
Step 2: Paint
Now if you want to paint it buy whatever color spray paint and make sure it's rated to paint metal. And make sure it's dry before you move on.
Step 3: Sharpening
Now all you have to do is sharpen it. First on the bench grinder,then on a knife sharpener to give it a finer edge. I tried it out on my bow target and it sticks in there nicely if done right. Enjoy it and remember to be careful.