Hello! How do I remove what looks like a nut? It is octagonal and has internal threads (had a machine screw in it before). If you look from the back, you can see 4 metal pieces (alternating from the 8-sided piece). I've tried just pulling it out but haven't succeeded. The console itself can be shifted a bit, but the octagonal part does not move. I've tried googling but can't find anything similar and I don't know what it's called. It's a console for an Olle Pira shelf. I don't want to damage anything as I need the parts. Any tips?
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