|Henny and Caramel share the chicken prison under the coop.|
Jenny is in the main run area.
So I invested in the "chicken prison" which is just a dog crate (bought off ebay for $26) which conveniently sits underneath the coop in the run, and has two doors on the front and side for easy access. Although the crate came with a solid, removable plastic tray for the bottom, I took it out and just put in some finer aviary wire for a base (the crate wires are too far apart for the chooks to stand comfortably), so the droppings go through into the run. I prop it up on a few big blocks of wood to help with this, and also to aid the cooling effect. I put water and a little feeder inside, plus 1-2 broody chickens and leave them to it. They stay in there, day and night. As the prison is undercover, being underneath our elevated coop, they're protected from the direct sun and rain.
After a few days, the chickens have usually been "punished" enough and I'll let them out. Usually, they go straight back to the flock, relieved to not have to watch the others enjoy the kitchen scraps while they miss out. Occasionally, Henny in particular will go back on the nest, in which case it's back in prison for another few days! More often than not though, they seem to be "cured". At least for a few weeks, when the cycle starts all over again.....