Squirrel Proofing My Bird Feeder

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get a bunch of two liter drink bottles and cut the small end out so that it's very snug around the pole. Then cut out the bottom, and then just slide the bottoms into the bottom of the next one. Worked for me. If that doesn't make sense, let me know and I will take pics of mine so you can see how it looks.

That is the only thing that has ever worked for me.