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There are two thing on the head of the tripod, one is the screw and the other is this springy thing. I always wondered, what does it do?

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Matthias
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    Already answered here: https://photo.stackexchange.com/questions/93119/what-is-the-point-of-the-depressible-peg-on-a-quick-release-plate/93120 It's an anti-rotation pin. – Steadybox Mar 06 '21 at 11:13

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