GT450/550 Supercharger Hub Install Tool
(in the Continental U.S.)
GT450 side for mounting flush
GT550 side for counter sinking hub on shaft
It’s not too hard to make a tool to install the GT450 hub because it sits flush on the end of the blower shaft. See instructions for pics details. You may find you don’t need this tool.
It’s pretty difficult to make your own tool to install the GT550 hub because it’s counter sunk. You probably want this tool.