I want to remove the drain stopper from my Crane 1950s vintage bathtub drain. I want to fish out the hairball from below the stopper. Everything works fine - the stopper raises and lowers with the handle, but I can't figure out how to remove it! Removing the raising/lowering handle exposes the overflow tube and the shaft that operates the stopper. The stopper raises when I lift the shaft (not opposite). The shaft is a solid copper rod so it cannot be withdrawn through the overflow tube opening. The stopper won't unthread, or lift straight out. I don't want to disassemble the whole drain if I can avoid it. Any help would be appreciated.