FJR Top Gun
Join Date: Jul 2013
Location: near Great Salt Lake, Utah, USA, Sol III
Collective knowledge needed: Rear axle nut
A hammer with a heavy head made of solid lead is called a dead-blow hammer. Use it with slowly increasing force, no more than needed, driving downward on the largest (thickest) possible breaker bar.
If all else fails, try some heat from a propane torch on the nut; you should not need excessive heat, but make the nut maybe just too warm to touch (if you even need that much heat).
2008 FJR1300A - Pirelli Angel GT (Spec A) tires, RDL seat, TPMS, GPS digital speedometer (US$25.00).