There's also the technique of getting one cup out (are you there yet?) then bashing the cartridge out with a hammer, then hacksawing the remaining cup into segments, then cold chiseling the segments out. It has been done!
Not yet, but that was my plan - I've drilled into it to try and get the bearings out to fit a hacksaw in to get the nds cup out to do the above... A complete waste of time but I don't want to just throw it out!
There's also the technique of getting one cup out (are you there yet?) then bashing the cartridge out with a hammer, then hacksawing the remaining cup into segments, then cold chiseling the segments out. It has been done!