Sparks shooting during centrifugal casting malfunction.
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Here's an 0:55 video on the centrifugal casting process:
https://www.youtube.com/watch?v=3G2sBqXkRT8
Previously:
https://www.homemadetools.net/forum/...2518#post96512
https://www.homemadetools.net/forum/...586#post128288
https://www.homemadetools.net/forum/...649#post123491
https://www.homemadetools.net/forum/...845#post119330
https://www.homemadetools.net/forum/...251#post103739
https://www.homemadetools.net/forum/...5830#post82618