When I was in industry, the machinists used Kroil penetrating aerosol too. I keep a can in the shop for the really tough jobs since it's pricey......but it works.........
On stubborn bolts/nuts, I always use impact, intensity set per the size of the fastener. One thing that somebody said and works is to try to screw the fastener in tighter a bit then go for the backing out. Other thing is back and forth, back and forth, etc., till it starts to turn. If you can get it out far enough to get some thread showing, get some Kroil on the exposed thread and run the bolt back in the hole then back out a couple of times to get some PO on more of the threads.
Last use heat to break the structure of the oxidized iron.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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