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Fold evenly into thirds broken down:
Step three led you astray. The "fold evenly into thirds" isn't meant to fold via the way you would to get a 8.5x11 piece of paper into a business envelope. Instead you have to fold it into thirds the way you would fold paper if you were making a Japanese-style, handheld fan. The pictures below show how I do it.
Step 3 led you astray. The pictures below are how I do Step 3 when making these.
Step three broken down: