[Cory]

you could create the hexagon profile on the inside of the bore, then extrude whatever open space is outside of it, or cut out the profile.

As to removing the hub, if you look in the window on the bottom left, where it shows all the mates, extrusions, holes, etc, you can roll over each one. When you find the hub, simply click on it, then delete it (delete key, not backspace).

Hope I was at least semi understandable.

Cory