The cost of the HC will be more than the cost of a treadle feeder that will stop the squirrels. Keep spare springs but other than that, no need for maintenance, no need to watch for new openings in the coop.
Never deal with symptoms until you fix the root cause of a problem. The squirrels are coming for the chicken feed. Control the feed, control the squirrels, rats, and wild birds.
Never deal with symptoms until you fix the root cause of a problem. The squirrels are coming for the chicken feed. Control the feed, control the squirrels, rats, and wild birds.