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Crease the Post-it by folding in half horizontally and vertically. Crease by folding in the opposite direction on the diagonals.
After creasing, it is easy to form the Post-it into the desired shape for fletching.
You will need to trim the folded Post-it to fit inside the barrel and will probably want to use a little glue or tape eliminate any space inside the fletching. Use a sabot (Wikipedia, Blowgun Forum) to launch the dart.