The author remixed this model.
There was already a great model by @Swollard, but its hole was a bit too small for my knurled nut heat insert. My table-stands have a ¼" 360° ball head, and even with the nut heat insert, the whole plate was a bit too instable for my liking. So, I also added a stabilization ring that fit well over the small circular plate on top of my ball head. That made the whole speaker-stand way more stable, so I can now trust it with holding my two speakers securely.