https://www.backyardchickens.com/forum/viewtopic.php?pid=4698943
see post #17 regarding a piece of hardware cloth
https://www.backyardchickens.com/forum/viewtopic.php?id=441944
https://www.backyardchickens.com/forum/viewtopic.php?id=493915&p=1
see post #4
I hope this helps or at least is...