Thanks Jim: I have determined it is the shaft. The blades seat correctly. Laying the problem ejector on a true flat surface and shining oblique light from the back, I can see the arc of the warpage. The other ejector shaft shows no arc. I'm of a mind to warm it slightly and squeeze in the vise, using copper jaw covers. Since it is not that much off being straight, I'm hoping that will resolve the issue. I don't think that will over-stress the metal but anyone with experience has a few more days to chime in before I go through gaining experience, which sometimes means learning what not to do ever again.
Cheers,
Jack