pocanokee

Thanks Jason and Bernie. Tried the screwdriver approach, but still couldn't keep it from spinning. I'll try cutting an access hole from underneath and torch the nut once I get a good grip on the head of the bolt.

While replacing the body bushings in my base model 1968 Buick Riviera, I have run into an aggravating problem with a particular bushing. In the frame arch above the passenger's side wheel well the bolt has broken loose, but corrosion will not allow me to turn the nut further and remove the bolt. The cage nut configuration fairly well inhibits my ability to get a wrench on the top of the bolt, and copious amounts of Liquid Wrench and WD-40 have done nothing to free up the seized nut. There is insufficient room above the nut to cut the bolt. I really don't want to cut an access hole through the passenger compartment to reach the head of the bolt, but I also don't want to leave it as is and have an annoying rattle in the back of the car. Any viable solutions or suggestions for this situation would be greatly appreciated. Thanks to all who respond. Paul