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

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Hello GF community,

I was wondering if anyone has had any success with creating some sort of clamp or jig that can be used in the laser bed to keep all four corners of a 1/8" piece o12"x20" plywood (or anything for that matter) flat on the surface of the bed.

Unfortunately, proofgrade plywood (which tends to be flatter than what I can get) will not work for most of what I want to do as I like to do the finishing myself.

I am currently using a combination of painters tape and magnets to adhere all four of my locally-sourced plywood down. The rare earth metal magnets that I have (~1cm diameter) do not appear to be strong enough to defy the warp on many pieces on their own. Perhaps stronger magnets would work?

I am very interested to hear people’s thoughts on this.

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Neodymium magnets first suggestion. You can get some of them (like the ones from old hard drives) that are so powerful they defy logic.

Second suggestion is a thin rotary wedge to hold the corners. Could use a tiny elevator bolt, or a countersunk hold in the rotary wedge for the screw/tiny bolt to hold the wedge down.

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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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1cm magnets are pretty small. I have good luck with larger ones. I listed my sources here:

https://community.glowforge.com/t/hold-downs/18005/6?u=evansd2&source_topic_id=18183
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