Hey, if you're not done already, try to break off the plasic piece of the link (essentially at the other end of the bolt, theres a ball that goes into the rest of the link.
Break off the link that surrounds that ball, then hold it with a pipe wrench. Thats what I did. Might take some messin around to get the pipe wrench on there right, but trust me, it'll hold.
Hopefully that helps...