Power Steering Pulley Install

Had to take the power steering pulley off today. Sorta confused when it comes to putting it back on. The pump shaft has a hex opening on it when i expected to find a threaded hole. And the power steering pulley remove/installer only came with threaded bolts?? Do I need to get a hex fitting for the installer to work properly?

Had to take the power steering pulley off today. Sorta confused when it comes to putting it back on. The pump shaft has a hex opening on it when i expected to find a threaded hole. And the power steering pulley remove/installer only came with threaded bolts?? Do I need to get a hex fitting for the installer to work properly?

On inside the kex there should be threads.