Terry and Jenny's solution started in their toy box. Are you ready?? It's...a slinky. Yep! Check out what they did!
The solution was as simple as dangling a slinky from the top of the string or pole, so it hangs down the length. When a squirrel grabs on to climb up, the slinky stretches and sends the squirrel right back to the ground. No traction on the pole = no reaching the yummy seeds!
Hope it works as well for you as it has for them!