833 OD sticking in 4th, chipped synchro

The ring that matches that hub/strut configuration has a different wider "key" that more closely matches the strut width.
The ring that I see there has the narrow "key" that matches the narrow struts of the older design. If all your brass is like that, and the 1-2 slider hub has the same wide struts as the 3-4, then they would all be wrong. I find it hard to believe that it would shift properly, assembled that way.
The lateral movement you mention, has to be less than the distance between two adjacent clutch teeth

OOPSY no you got the right brass in there, my memory ain't what it used to be

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so you can ignore this post, all of it.