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I cheated. I went on SDP-SI and grabbed the gear models for some gears and pulleys they offer and I cored out the centers. Made a good base for making my own hubs on them while ensuring the geometry is perfect.

So this is very strange, I measured two bullet nose plates and a blue eagle chassis and they all measured about 22 degrees. Not what I expected.

Here is the parts list and a pic from the eagle manual since it came with the ball diff. Maybe this will help

Sorry the pics are sideways. I don’t know of a way to fix it on here

It looks that way to me from the pictures. There is a larger gap between the teeth and outer part of the diff ring, which looks like the ring is the same