Man, the thread has been quiet!!
No pics, but I finally just gave the chickens a hanging head of cabbage. I have none of the screw in corn holders, So I drove a heavy duty chopstick through it, with a bit of end sticking out of the bottom. Then I took cooking twine and tied it to the bottom, ran up to the top, wrapped the top of the chopstick, then back down and around, to make it surround the cabbage head on 3 sides, then just tied it off and hung it from a screw out in the pen. Hopefully the string holds up to the accidental pecks. I will keep an eye on them. All 15 birds eyed it like it was gonna eat them, until I pulled a few leaves loose. Of course Red my Speckeled Sussex was the first to try it out. She is the most curious one.
Might get pics later, but it isn't much of an invention, compared to used the corn screw.
Someone told me that they use a wire coat hanger to hang theirs...unbent and then skewering the corn or cabbage and bending the hanger in such a way that you can hand it up.