I squirrel-proofed a feeder by threading a large piece of plastic above the feeder, then crimped split-shot fishing weight to hold it up. They finally gave up after falling off several times.
I like squirrels enough to plant a pin-oak, but they, and the chipmunks, live in their world, not mine. My bulldog keeps them honest too.
Two things.
I need a dog. Best security, next a firearm.
I live in Dertoit, and seeing a Squirrel backed up tight againt my Maple in February is very neat. Ya. I used the word neat.