With Steve’s help, I have obtained some rare images of the disassembly of a Sears & Roebuck Allstate Locking Hub.  Accompanying them is a rough guide.

Here, the bolts are being removed:

Here the bolts have been removed.  Now, the big ring must be removed.

You need to get a hold of the ring and flexing it inward to get it out of the channel.

Here is the cap being pried out:

The ring holds in the four rectangular blocks that engage in the cams inside the cam to switch from locked to unlocked. After that, you’ll need snap ring pliers to remove the ring with the two small holes that you can see in the center around the spline.

Here’s another angle:

Here the parts are getting cleaned:

Shows a box with all the parts from both sides (two assemblies):