I saw this extractor, but doesn't seem to have 1/4" (6.35mm).
https://www.bearingprotools.com/products/bearing-puller
I might go to the hardware store and look for a 6mm anchor bolt and see if that works.
I don't want to knock the 5.5mm step in the middle of the internal spindle, because I'm worried that I might bend it. (I did try it with a hammer and a 6mm bolt, but nothing moved.