This is a replacement knob for IMAGE brand pole mount speaker tripod stands. You need the old knob to get the steel bolt that was molded inside the original knob. The bolt in mine was a M6-1.0 x 60mm completely threaded.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4z60Grn1ieI
I used PLA and it worked out nicely.
Part required some sanding to remove sharp edges, since it's a hand know you don't want sharp edges.
I cleaned up the opening for the bolt head and threads with some small files. The bolt head was heated with a heat gun and set firmly into place with a hammer and steel point to prevent it from coming out.
Totally designed in Tinkercad by taking measurements from the original. It's a knob close is good enough, I'm not out to duplicate an injection molding machine.