I bought mines and it has a small flat on the bottom. Is that suppose to be there?

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I don't see how Storm Pegasis spins forever in the anime... :O

The bottom part is more 'shallow' and less concave, but not really flat, if that's what you meant.

Anyway, please refrain from creating a new thread for a simple question. Use the "Ask a question, get an answer! #2" thread.