Glass donut What's It?

By Bill Meier; posted April 16, 2017

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A few people in the hobby have a piece like this. It's about 2 1/4" in diameter and 1 1/8" tall. "Donut shaped" with a 1" diameter hole in the middle. It's crude and old looking and people had no idea what it was. So of course, it "must be an insulator" right? Well, [id=496924528; read onů]