Engine testing gimbal.
https://www.youtube.com/watch?v=UwxO3qivx6k
Previously:
https://www.homemadetools.net/forum/...757#post159733
https://www.homemadetools.net/forum/...470#post151091
https://www.homemadetools.net/forum/...3268#post98539
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That's so freakin' incredibly cool! What a perfect illustration of the need for a dry sump!