Can you get a bigger box wrench on the end of the other to add length? Put the open end through a bigger box and link them together If there's room. Give the base of the o2 a good few whacks with a hammer and chisel or something long and steel. Also try to heat the o2 with a propane torch and get it good and hot then let it cool off. This crushes the rust in the thread.
That's all my tricks.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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