i can not get the strut off my 83 300td seriously

[comrade]

i have the wierd brass flat saucer brace thing on the top of the hydropneumatic strut with the equally flat brass screw thing in the middle of it all this on top of a rubber bushing kind of washer thing ... screw in the middle takes an alan wrench but when i try it...it really seems wrong like im definetely gonna strip that screw .i manage to seem to turn the whole strut assembly but the screw doesnt give...anyone know the trick to this setup?? its kind of an emergency !