So being an idiot assumming that all square tapers are the same, I tried to take the Truvativ Isoflow crank off my bike. I uncrewed the lock bolt, inserted the crank-extractor and started to turn. Well it didn't bulge so I pushed a bit too hard and stripped the threads. I did some reading and realized that Truvativ crank came with a self-extractor nut inside and it seems to requires a big square bit to fit in. So now that the threads are stripped, is there anyway for me to get the crank out and what tool do I need for that self-extracting nut?