I don't remember having this much trouble with mine. Maybe it's the same kind of forgetfulness that made me have more than one kid. If the bolt's got enough play in it to move around, it should come out. Does it rotate inside the control arm or is it just that the whole assembly moves around. If the latter, maybe you can break it free with the socket from the other side (that is, get it to start rotating) and it will come out after that. Alternatively, can you get a C clamp on it and use that to drive the bolt out? Or a gear puller? If I'm picturing it correctly, I think you could get a C clamp in there (although not quite square), with the top of the clamp against the frame and the screw against the bolt and press the bolt part of the way at least.