Squirrel Blocker

Fits *very snugly* onto a 3/4" pole (I may upload a looser fit).
The two piece come together with M4 screws & nuts (2ea.) between them a sheet of something gets deformed into a simple peak shape. I used carboard reinforced with electrical tape, but other materials to consider would be: plastic corrugate sheeting, acrylic sheet, or sheet metal.

So far, the squirrels haven't defeated this one... Yet.

Size of shield: 16" square, with chamfered corners.

1 Month Review
The squirrels try to climb, but they just nose against the apex of the shield and give up.