Unwanted visitor to the bird feeder

We have had this bird feeder strung between 2 trees for many years but this is the first year the racoons haven't been content with the leavings on the ground. Have been trying to get a pix of their acrobatics- they climb the tree , manage to bypass a circular barrier, tightrope walk upside down and help themselves to as many sunflower seeds as they can while hanging upside down from the string!! I finally caught one with the telephoto through the kitchen window where he didn't see me. Will have to get a remote for the camera on the tripod. And then change the seed to something they don't like!