I said that I'd post some pictures of our recently acquired Grandpa's Feeder. It was a lovely bright dawn this morning when I went to let them out AND I remembered the camera, so:
Here's the feeder in its closed position ...
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... and in use
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The thingy is rather a big lad, so he prefers to stand back while one of the hens stands on the treadle, but he's quite capable of opening the feeder with one leg and feeding that way.