Need Help: Ideas for bed clamp or jig for warped wood

Saw one the other day where someone (kittski?) was using cotter pins and strong springs to hold it down.

Yep, here it is:

https://community.glowforge.com/t/i-tamed-the-warp-springs-and-cotter-pins-to-the-rescue/12532?u=jules&source_topic_id=18183
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