Expansion spring

Expansion springs are used as electrical connectors in some children's electronics kits. They are easy to use with bare fingers, they accept multiple wires, they require no learning or expertise to use them, and the cost is low.

Source: Wikipedia — Expansion spring (CC BY-SA 4.0)

Expansion spring

Expansion springs are used as electrical connectors in some children's electronics kits. They are easy to use with bare fingers, they accept multiple wires, they require no learning or expertise to use them, and the cost is low.

Source: Wikipedia "Expansion spring" · CC BY-SA 4.0

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