For the really stubborn cups I use a vice but i use the bb tool that you are using and slip it over the fixed cup, I fix an adjustable cup in the other side and clamp the bb shell with cups fitted into the vice. The vice holds the tool on firmly and I can normally undo it. I have had to use a mallet on the tool which helps to break the bond.
HTH, quite difficult to describe and all my bike stuff is in storage at the moment so I can't get a pic up.
HTH, quite difficult to describe and all my bike stuff is in storage at the moment so I can't get a pic up.
