Didn't you get to figure it out from reading the "sticky" or looking at the pictures, that i helped you out with?
Nothing hard, difficult, at all in the installation of the bushing and the shaft together.
All you need is a piece of water pipe, fence pipe, the same diameter as the outer diameter of the bushing.
That's the "factory" tool.
Easy, peasy.
Don't have a piece of pipe, go buy a length, at the local hardware store, or plumbing shop.