I called Avlex and asked if other capsules are available. I was told that they are not, and there are no plans to ever make them available, but they may sometime in the future. I told them that I know the factory also makes microphones for other brands and was wondering if there are other brand capsules that might work. The tech guy said that no other capsules will even physically fit on the bodies. The capsules have a pin that pushes against a spring loaded contact on the body. Both are about 3mm in diameter and are centered inside the 20mm diameter case. I doubt this design or the threading is unique, but who knows. I have pictures if anyonw is interested. Too bad.