As long as we are resurrecting a real old thread, note that Ultegra and Dura Ace Octalink cranks (FC6500, FC6503, FC7700) had autoextractor bolts. There is a collar with two spanner holes that screws into the crank extractor threads around the fixing bolt. The proper removal technique is to loosen the center bolt with an 8 mm hex wrench a turn or so to where it will get tight again as it comes up against the outer collar. Continuing to turn the bolt will press the arm off of the bb spindle.

One more thing; make sure the 8 mm bit or hex key you use is in good condition with sharp corners. A worn, loose key will cause just the problem that started this thread.