Suggestions all good. Little trick ive pick up over the years is to give rusted nuts/bolts/studs a slight clockwise turn before the counter.
Head studs have interference fit. Even if factory fresh their going to come out hard.
https://www.machinedesign.com/fastening-joining/article/21812743/studs Pretty sure reasonings are
-Nuts would break loose first
-Factory could drive the Studs to the height they required
-Some studs go into water champers and the interference would help seal.
WASH YOUR HANDS
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