Bigwheel hub - part3

Ok, so I decided to start from scratch with the hubs. I didn't like the welding so I started out with a piece of solid bar.

I was thinking about the hub-axle connection. In most cases, you would want to use a broach to create a raceway for a key. But that would mean I need a broach, a press and probably a milling machine for a more accurate setup than what I do on my lathe.
Hmmm... I will have to put some more thought into that.