I have literally 100's of diff side covers...
With regards removing pot joints, I use one method which works 99% of the time....
One cold chisel against the back of the pot, and strike hard in the direction of removal, most of the time, one strike is all that's required, occasionally two, and that 1% of the time, more drastic action may need to be taken.
It's always best to remove the pots before you remove the diff from the gearbox.











