Hello,
i hope that there are still a few centimeter of the thread rod left. If so, try to get it out with a gripper or try to tighten a nut and then unscrew the thread rod.
für die deutschen leser,
http://dict.leo.org/ sagte mir:
thread rod = Gewindestange
gripper = Zange
to tighten a nut = kontern
stimmt das?