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Stonehedge-
I’m not sure what exactly resonates. The seconds hand moves each time the pallet lever “beats” from side-to-side, so thy both move at the same time. Sometimes you can hear a “boing” which I wondered might be the balance spring, but you may have a point about the seconds hand. I guess the only way to know would be to remove it.
rodabod
Some movements are louder than others, and some ping. They tend to be louder when they are running with good amplitude which can be a good sign. Smiths lever escarpments are loud.