I just found this site by Timothy Moyers, an artist from Warren, Ohio, who makes darts from wooden dowel rods with copper tubes coupling them together. His fore-shafts are larger than the dart shaft. This is almost exactly the opposite of what everybody else is doing in the today’s atlatl world. But, oh my, they are pretty to look at. It’s like he never went to an atlatl event to see how anyone else does but just sat at home alone and figured out a way to do it all on his own. I truly admire his work.
“How to make a good dart with easily found materials” at atlatl.timothymoyers.com