Thanks to the info found here I have come this far... However I need help... How do I take out the top burr, I already took out the 3 screws. Only push them with force?

And have no clue pf how to take the bottom burr either...
Any help will be highly appreciated...
Also, were they in need of replacement or am I doing this in vain?

It was just a matter of patience, soaked it in cafiza for 35 minutes, and push with force.. Now trying to take out the 3 screws of the lower burr.