Fair enough. It might not work for smaller chicks.
I believe aart found that the key to preventing the feed from being kicked out was the plastic hose around the opening in the bucket, which made a lip, plus the long reach to get the feed, if the openings in the funnel were calculated...
Ha! Tell that to The Moonshiner! If I remember correctly, his feed runs to the mill require the full bed of a large pickup truck! Have you seen his home made incubator? I think it holds more than 100 eggs.
For me, with a paltry 3 hens, preventing spilled feed was all about not attracting rats.
I remember following a thread by @K0k0shka where she had a smart-ass cockerel who kept billing out extravagant amounts of feed, and her search for a truly waste-free bucket feeder to foil his billing habit. Took me a while to find it...