I was just looking at ebay and found a Carl Wagner bell. In the write-up about the bell, the seller made reference to a video on YouTube about Carl Wagner. I’ve watched it and found it to be quite interesting. He doesn’t talk about bells specifically but he does describe his method for making his bronze sculptures. The video goes for 9 minutes and 39 seconds. It’s a little hard to hear in places because of the wind blowing across the microphone.