[Complete] 25195 Plate, Modified 2 x 6 with Pole Holder Pin

[Philippe Hurbain]

As always, need more details.
Dimension of the pin? Height and outer diameter?
There must be something on the inside of the pin, making it spinn around the spiral pole?
What does the bottom look like?

Do you have the part?

Actually it seems to be a "nut" that goes with this "screw": https://www.ldraw.org/parts/official-par...rtid=23421
See building instructions https://www.lego.com/biassets/bi/6163302.pdf
...but that doesn't give any details on the bottom of the part.