WWI Scarff ring airplane machine gun mount.
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More: https://en.wikipedia.org/wiki/Scarff_ring
Previously:
https://www.homemadetools.net/forum/...768#post170973
https://www.homemadetools.net/forum/...161#post176537
https://www.homemadetools.net/forum/...211#post176738
https://www.homemadetools.net/forum/...299#post177070
https://www.homemadetools.net/forum/...303#post126902
https://www.homemadetools.net/forum/...002#post171879
https://www.homemadetools.net/forum/...058#post172049
https://www.homemadetools.net/forum/...491#post132005
https://www.homemadetools.net/forum/...173#post141612
https://www.homemadetools.net/forum/...220#post165455
