Can you send the website for the treadle feeder. I have 27 chickens - the last nine are not laying yet, but I need some kind of feeder that I don’t have to worry about the rodents so much.
I would recommend mineral oil (baby oil without all the additives 😊), which should be less unhealthy than Vaseline, and if that doesn’t knock it out after a week or two, try vaseline or VetRX. One of my oldest hens has this problem and it won’t go completely away, but I treat her and she gets...
To deter airborne predators, netting is not normally necessary. Only runnning several lengths of cord across the area to block a direct light path in and out will almost always do the trick.