What does that little nubbin on the end of the bolt do? It looks like it latches into something?
"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".
@Scilly.Suffolk started
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What does that little nubbin on the end of the bolt do? It looks like it latches into something?