It is a post that has an arm that can swing out so that you can torque on the post. I've seen it before but not sure where!
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$\begingroup$ a lever comes to mind, but why do you call it a fastener - it does not fasten anything. $\endgroup$ – Solar Mike Jun 25 '20 at 7:44
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$\begingroup$ Sorry, it is typically attached to a quarter-turn fastener I want to say; so not a fastener itself. $\endgroup$ – Zachary Russell Heineman Jun 25 '20 at 7:46
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So, this may be what you try to describe:
Image source: https://www.tractorsupply.com/tsc/product/lockdown-self-locking-hitch-pin-625
This type of device usually rely on an off centre hinge or pin and gravity to make them operate.
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$\begingroup$ Seems pretty close. Also found this one but not quite sure how it works: e-rigging.com/…. $\endgroup$ – Zachary Russell Heineman Jun 25 '20 at 7:52
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$\begingroup$ Self locking usually means an off-centre hinge point and gravity, but your question did not ask "how does it work"... $\endgroup$ – Solar Mike Jun 25 '20 at 7:53
