Here is a faithful modeling of the classic Astatic JT-30 bullet mic. I modeled it myself in Fusion 360 from the original shown in the pics. It will take an original Astatic element, but also, a classic Shure CM/CR element. To use the Shure element, it needs a specialized mounting seal/gasket. These are available online, you just have to search for them. Mount any other element in it if you can make it happen. I have a few of the originals. They are my, and many others' favorite bullet mic for playing blues harmonica. Print it up! It's a great harmonica mic shell and much lighter than the original. I hope you enjoy it.