Hi Christ,
Yes I realize that, I have the Alt moving back & forth. I would think the square would move somewhat. 14 plus years of NE Ohio salt is what's keeping it locked up. I was tapping on the bolt head, 12mm, but no go. I was talking to a mechanic & he uses a air hammer device. Wait I have a palm nailer somewhere!
Dave
He said I may have to replace the bolt when I'm done, he says that's what usually happens. Maybe a little grease before I install?