well I don't mind the coons and other critters eating the corn I use
But myabe you might look into some of them cheap electric fence set ups, that work off solar power and a few batteries, like they use in and about tents to keep bears out
I would think they would work great for keeping unwanted coons in a feeder out??
Tractor Suppy also sells sheap set up too??
Plus don't forget , that this time of yr, with so much food coming out, that deer will hit a feeder a lot less, craving fresh foods over store bought made stuff, or , that's my opinion and results at my place!