The jig guarantees that the axel hole of the hub will be at the center of the wheel.
If your pirate ship should happen to need a new helm, you can always stop a this point.
So there you go. It took far longer to record and photograph the process than it did to make the wheel. Just a couple more words:
Remember, you're building little toy wheels, not components for the Space Shuttle. Don't expect perfection.
The bronze and green cannon shown in the first post on this topic was a heavily modified $1 craft store kit that will have its own post one day. This latest wheel is destined for a future toy of this local landmark: