https://www.sparkfun.com/products/8077
Have one of these on a board for class, but the springs are harder to push down. Works by pressing the spring-loaded button down, sticking a wire in, and releasing the spring. The connection will be clamped down to the metal by the force from the spring. Really useful for prototyping connections that require frequent swapping of sensors/actuators, but the component is really big and extrudes far off the board, so not recommended for pcbs where you know what components you want ahead of time.
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