On Sunday, August 18, 2019 at 8:01:26 AM UTC-6, JD Williams wrote:
John,

How did you make it? 3D print? Thats a perfect solution!
JD

I ordered 6" lengths of 3/4" Delrin rod off Ebay, and then drilled the end first with the smallest neck diameter, and then the larger ball diameter at the appropriate distance. Then it was hand-shaping with a cone grinding stone in a Dremmel Tool.