Two-part molds for multiple shot could also have them arranged in a chain. I don't know whether tree or chain was the most common. I've seen replicas of molds for casting single shot, but I haven't seen any original old single shot molds.
I think thumbshot were just for emergency use, if a proper mold wasn't available. Mainly because the classic lead shot, like a an egg with pointy ends, is a very good shape for slinging, and a thumb-tip isn't as good and will have worse aerodynamics.
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