You could try a nun on top of a nut..if you get me lol.. Like this all i did is put two 12mm nuts on top of each other tighten both nuts till they get to the bottom of the thread, give them a good nip then untighten the bottom one makeing the bolt work against the top one then it should start unwinding from the turbo end...it worked for me lol Sorry for the pic quality my camra started takeing the piss