I'm not sure I really followed you on the notch thing, but I've definitely used vice grips to hold nuts while I spin the bolt. Generally there is something in the way to keep the vice grips from turning...
I did not follow the notch thing either. I have also worked on boats that you could not get a vise grip into the area to keep the nut from spinning.
I had a dream, I was sailing, I was happy, I was even smiling. Then I looked down and saw that I was on a multi-hull and woke up suddenly in a cold sweat.
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