Those are common on doors...
https://discountdoorhardware.ca/product/flat-head-12-24-combination-screws-satin-nickel-100-pack/
I've never seen them otherwise.
Alternatively put an insert in the plywood, or drill and tap the wood, that works reasonably well, but better on hardwood than plywood.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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