Looks like standard cup and cone, no?
So cone spanners, disassemble, clean, grease reassemble?
Not done that before, but I like learning.
Shout at them until they work.
But yeah. You might need a axle clamp.
Unless they are causing issues whilst used, i.e. have loads of slop in them, I wouldn't touch them :) Quando stuff is cheap and cheerful, you might not be able to make them 'better', but you could waste loads of time trying.
@mashton started
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Looks like standard cup and cone, no?