If you're looking at an IH service manual (Ill. 44?), the thrust bearing consists of the three parts shown just to the left of the thrust spring and pins. It's basically a cage (the center piece) to hold the balls of the bearing, that is sandwiched by two races (the outer pieces) to hold everything together and in place under tension. It is in fact three separate pieces, not counting all those little balls. A new one comes packed in grease to hold it together and thats a good thing to do if trying to put a used one back in place. That bearing, and the thing that looks like a bushing to the left of it in the illustration I think you're looking at (called a sleeve in the parts book) wrap around the outside of the shaft of the governor pinion/gear. The thrust spring and pins fit into a recess in its center.
That bearing is notorious for being dry and worn out, so that when you remove the governor, taking the tension off of the thrust spring, the three parts open up and some or all of the balls fall out of the cage and go, like all small parts, to who knows where.
The only way that comes to mind (having learned my lesson) to avoid that, if it is going to happen, is to remove your distributor or mag first, then loosen the governor housing, and keep tension on the thrust springs as you wind the gear forward while keeping tension on the thrust spring as you move the housing forward.
Clear as mud, I'm sure, if we're looking at different illustrations. Let me know if I've missed your point or you need more.
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