Not quite sure if I am understanding you correctly, but I think you are saying it isn't like, a flat, edged geometry...

...its more like a sort of ... very angry, 'fuzzy', elongated cylinder with a roughly hemispherical 'endcap'.

And the sort of... exit point, or emmitting point of the 'blade' is... more like an camera aperture or a nozzle.

But you also say this O, this eye of the needle... is spinning?

That is a bit of lore I am not familiar with, could you expand on that?

...

But yeah, lightsabers work internally differently than say, the Mandalorian Darksaber... which actually is a proper blade, and uses... some other kind of arcane way to generate and sustain itself, I'm not up to snuff on that lore.

Also just kind of as a general addendum:

There are various materials in the Star Wars universe that can deflect or totally decohere and disperse the ... 'coherence field' of plasma bolts / saber blades.

The Imperial Guards have pikes, staffs that are made of some kind of metal alloy, which can block lightsaber blades, and presumably also deflect blaster bolts.

They may be made out of Beskar, the same material as Mando's armor? I am not sure.

Also, the uh... whatever the Darth Smiley's helmet is made out of in The Acolyte... while I think that show is basically a complete mess both as a show and in lore terms... that material/alloy, cortosis, is actually present in a good deal of the older canon, and it seems to have some kind of ability to nullify, extinguish, not just repel, the 'coherence field' of most other 'plasma' based weapons.