"Snap retainer", ie safety clip to prevent the screw from falling out.
But what does it snap into? I got a similar looking bolt with spyres, but the holes are blind and there's no obvious release mechanism for any kind of "snap".
Sorry, I wasn't clear: the wire clip (the snap retainer) attaches to the "little nubbin".
Item 26.
@chiroshi started
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"Snap retainer", ie safety clip to prevent the screw from falling out.