Originally Posted by
merziac
Hopefully the cup survives, even if you don't reuse it, it will be valuable later.
Well we got it out in good reusable shape! Combination of the Sheldon Brown tool, overnight soaking in canola, and my LBS used a version of your method to clamp a regular large adjustable wrench to work in concert with the Brown tool and it cracked free. Threads on cup and shell look good, races are clean, on to the next step.