If your handy with tools you can build a treadle feeder the plans are here https://www.backyardchickens.com/articles/building-a-treadle-chicken-feeder.47900/ alternatively you can buy one ready made. In my opinion of what I have seen in commercially made chook treadle feeders Grandpas feeders are the best.
https://www.grandpasfeeders.com/ I have a home made one and it has been going since Dec 2013 and is still going well. It takes 2 or 3 weeks to train them to use it and there is no looking back, as soon as one learns the others copy.
https://www.grandpasfeeders.com/ I have a home made one and it has been going since Dec 2013 and is still going well. It takes 2 or 3 weeks to train them to use it and there is no looking back, as soon as one learns the others copy.