About Tornado Beystadium

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Does anyone know how to open the black knob which placed under the spinning plate of a Tornado Beystadium ... i need to fix this broken item of mine.

Thx for your time.
Hi, that question belongs in the Ask a question, get an answer thread:
http://worldbeyblade.org/Thread-Ask-a-qu...n-answer-2

Just re-post in there.