Finish Machining 

1. The center bore in the hub is finished taper bored to the final dimensions. 
   A key slot is cut into the center bore of the hub section.

2. The center bores in the forks are finished bored to the final dimensions with a step for a bearing seat. 

3. The outer faces of the forks and the heavy hub are finish milled flat. 

4. Two bolt holes (~1" diameter, 2" deep) are drilled and tapped into the main hub, for attaching a cover plate.