I have something that looks almost exactly like your drawing. It's orange, with 2 white fan blades inside. They seem to be attached by a shaft running through the middle of the device, and when I turn the blades of one, the other turns too. The diameter of the ends are different sizes though, unlike your drawing. One end is about 1 1/2 inches in diameter, the other is close to 1 3/4 inches. It's been in my shed forever, and I may have used it once, although I really don't remember. You can have it if you want it. Maybe a moderator can help us facilitate me sending it to you. Not sure what shipping would would be, I'm on Long Island, in NY. Worth a shot I would guess. The price is right, free, lol.
Tom
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