I got the same pole with the 4 arms. See my goldfinch?
Grackels are noithing more than crap machines! They ravage my feeders and my suet stations.........but hey...I guess they gotta eat too..............(but I do tend to scare them away whenever I can) ;-)
I DO see the goldfinch, and a handsome male he is!
I am not a “professional” but I do put out feed and have several pairs of Cardinals and their oung...and 6 sets of bluebirds and their young...gold and house finches..Nuthatches.......chickadees.......Grosbeaks....Mockingbirds..FLickers......Downy and Hairy woodpeckers....the damned grackles........and 2 bluejays...
life is good.......
When I had my previous home...one summer I counted 68 different varieties of birds coming to my feeders.....It is truly better than television :-)
Same with Black-Eyed Susans (Rudbeckia goldstrum).