Re: removing bearing cups on Micargi
They aren't threaded. They are pressed in.
Take a wooden dowel or something long enough to reach into the bottom bracket and push them out from the far side.
Use a mallet or hammer on the dowel
Work your way around the circle a little at a time.
They will work their way out. Don't try to pry them out.
You don't want to get that BB out of round or it's toast.
If the frame tubes protrude into the bottom bracket you may need to get in there and file or dremel them out of the way for the new one to fit.
It's not too tough..