I have a this bird feeder. Works for doves and large nasty birds.
Heritage Farms Bird's Choice Squirrel Proof Feeder
The Heritage Farms Bird's Choice Squirrel Proof Feeder features a weight sensitive metal perch that closes access to the seed tray when squirrels attempt to feed. The attractive spring operated perch is adjustable to allow or exclude large, heavy birds as well as squirrels. A seed baffle design reduces wasted seed and helps keep the feeder area clean. The reservoir has a large 6 quart capacity and the clear plastic reservoir windows make the seed level visible at all times. The feeder's TopLoc feature holds the top open when filling, allowing you to replenish seed one-handed. The feeder has a durable speckled-green powder-coated steel construction that will last for years to come. This feeder may be hung with the included 13" bracket hanger, pole mounted on a 0.75" to 1.75" diameter pole, or placed on a 4" x 4" post using the included adapter. Five year guarantee.
I have the same one. I think I want to convert it into a squirrel trap.