how much of the studs were left after being snapped?
I snapped one a few months back and tried to get it out with the procedure you mentioned but didnt get far because there was not much left of the stud. I didnt clamp onto it really hard because i was afraid of making things worse. I put some rtv gasket gasket maker and tightened it back up. Now the area where the stud was broken and has made a small leak. I will be attempting this again this weekend. Any suggestions?