I am suprised broom stick did not work . Makes me wonder if something else is not cool down there . I always use my 3/8 air impact tool to spin those bolts off and on . FYI always start them by hand prior tightening . The fast action of the air impact seats them properly everytime for me . If I was you I would take them apart again and thread bolt into assembly and see if threads are messed up. Worse case a tap will have to be chased through threads to clean them up. Again , wish all you guys with issues lived closer . I have 4 decades of tool collecting that likes to be kept shiny from use. Heck I got tools I forgot I even have here . When I get to know ya all better I got no problem shipping them to loan out for shipping costs .
Rail
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Living life to the fullest to avoid regrets later ,,,,or I am a complete loon ! Either way I am good