If you hit the local hardware store, grab a piece of pipe that has an I.D. a little bigger than your breaker's O.D.. You can slip the cheater pipe over the breaker. PB'ing the tar out of the fasteners helps too.
You might be fighting threadlock (for instance, I threadlocked [red] my fasteners back on there). Heat normally works in threadlock but you dont want heat near your bushings.
A 3-5' cheater should help a lot though.
Good luck.