Design Update
After several years of making the previous version of this gadget for various people around the world, I was forced to redesign it a little so that I could print the parts on a slightly smaller 3D printer, because the original printer I was using sorta started having too many problems. After I managed to make a few of the covers on the other printer, I decided to keep working on it a while and update the design with a few changes that I have thought about over the past few years.
Here's the blog post about the previous design: https://whirlysworld.blogspot.com/2018/01/benjamin-airbow-missing-accessory.html So, I won't repeat any of that stuff here. Most of what that post says hasn't changed. This post will just cover the design changes for "Version 2".