That one I don't know completely. I know they are turned on the lathe but I don't know when the thrust rings get welded on. Did you see the very small evidence of the weld?
I didn't, but I didn't look for it. I will sometime. When I tried to imagine how they were manufactured I thought they might be swaged larger then machined, but welding on a collar would certainly work. Once welded it's still one piece. The benefit of an integral thrust ring remains.
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