I needed to figure out a way to attach the antenna wire to the carbon mast. The problem was that the top of the mast is made up of very thin parts. I decided to omit the first part and place the jig on the second part. It is still thin (and delicate) at the top, so the jig is placed at the bottom of the second piece from the top.
The fixture has a top diameter of 3.0 mm and a bottom diameter of 3.1 mm. When threaded onto the mast, it "snaps" into place. After that, it is enough to just rewind the antenna wire.
The material is PETG.
The author marked this model as their own original creation.