[willson.thomas]

To answer more questions...

We are using a key rather than hex because that is what the Banebots planetary transmissions use, which are what we have used in the past.

We need a 5-axis because it has to be able to drill the hole from one side of the hub, then flip around, and drill the hole exactly on the other side. I do not believe that it could be done manually, regardless of the center design. I do not see how the center would be milled out or how we would get those holes drilled at an angle like that.