I may be wrong but I got the impression from your last post that you may think the throw-out bearing is the same as the pilot bearing.
The pilot bearing will be a ball bearing pressed into the end of the crankshaft but more likely into the flywheel. They can seize up and eventually grab the splined clutch shaft through a galling action. I had a Cub do that to me many years ago. The main difference with the Cub is that the pilot bearing was a bronze bushing. Your bearing should have made some noise when disengaging the clutch before it seized on the shaft. This is not a diagnosis of what is actually wrong with your 504.
A throwout bearing may have some wobble. The bearing will still be good. It is just the bearing carrier/yoke that is allowed to find its center when pressed against the pressure plate fingers. In other words, it floats a little.
I don't fully understand TA's as well even though I have replaced one and, at the same time, changed the output bearing, flange, shaft to the larger size. I just set them according to the manual.
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