Dome Squirrel Baffle
Dome squirrel baffles are used to block squirrels from hanging bird feeders. If your squirrel reaches your bird feeder by jumping onto the top or climbing down the wire supporting it, you need a dome squirrel baffle to block him.
I have not personally used the dome squirrel baffle because none of our bird feeders are hanging feeders, but I have heard that if the diameter isn’t big enough, a very acrobatic squirrel will be able to get around it.
The Bird Shed makes a fairly big dome squirrel baffle (19″ diameter) which can be either hung or pole-mounted.