Use a good penetration spray such as PB blaster and reapply about every 1/2 hour for several hours. Then use a 1/4" electric impact wrench (about 200 inlbs of torque). Replace with grade 8 acorn nuts; use copper anti-seize on the threads. I used 60 inlbs of torque to set the new nuts. That worked for me.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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