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Terse: Polymetal/Dibond.
Verbose: Whatever they make difussers from, depending on whether it's a flat plate or complex as they tend to be,
You'll notice the pivot point is raised, such that as the floorplate deploys it swings down and forward to mate up to a rigid difusser.
Ignore the scalloped edge. That's depricated. I lean more toward fiberglass rods for bows, rather than inflatable.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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