Metal Casting at Home Part 12. When Castings Go Bad

[postlink]http://engineering-videos.blogspot.com/2011/04/metal-casting-at-home-part-12-when.html[/postlink]
http://www.youtube.com/watch?v=KUtJNnYnp2Qendofvid
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Metal Casting at Home Part 12. When Castings Go Bad

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