I broke my U-F28 sickle mower. Doesn't seem to be a very popular mower as I haven't seen many postings for this model but was used on a Farmall 300. I had the pitman arm break and it broke the Pitman box connection bracket (item 7). I can't for the life of me seem to get it apart. The nut that holds everything on (item 1) will spin but nothing seems to loosen up. I'm looking for ideas on what I need to do to get this apart so I can replace it. I have not tried heat, I don't want to tear down the entire box to cut it off.