Can someone tell me what went on this threaded hole in the image I attached?
I understand that there were cardboard mailers, pricing and spinners available but I have never seen one. I was told you can see them on eBay on occasion but I don’t know what to search for to see one. I was also told I can make one but need to know what it looked like to be able to decide if I even like the look.
Any help is appreciated.