Crank carrier also had the tank and hand polishing treatment. Had a strange one here as I reassembled without the bearing to torque to measure the roundness of the bearing seats and was seeing about 0.01-0.02mm differences across the face. I found that there were deposits of carbon/oil/stuff that I didn't notice the first time.
Spent some more time cleaning and polishing the seats and was seeing, sometimes only 0.01mm differences. Didn't think that the build up could be as much as that, but it could have dried on when I removed the bearing I guess.
You can see it a little in the phot below between the first seat on the left and the next ones
