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There has got to be some small issue with the black spool's rewinder.

For instance, a couple of things in the 2nd picture (20190807_101151) are curious. The cap's bearing does not seem to have been inserted fully. That would make the spool hub assembly a bit wider than normal and cause the stand's sides to be pushed outwards.

The large gear appears to be only slightly engaged with the gears on the cap. This may be an illusion of perspective and not a real problem. For reference, the teeth on the large gear should be completely engaged with the teeth on the cap as shown in the attached picture.

does the last picture (20190807_101059) show the location of the track on the black spool when it was stuck?

Afraid I cannot help with eject settings as that is that something I have ever needed to change....