Yes, tried lowering the jack with the breaker bar on a block of wood. Was as much force on the breaker bar as I dared to use (without a handy brick wall in the middle of the garage), but no movement from the nut.
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Where are you? What size is the nut?
break out force almost always exceeds torquing force.
also yes the milwalkee will undo the staking for you, it will also in the process if your luck follows some hapless fool who then needed me to replace a stub axle, remove the thread of the stub shaft.
Heat? Not too much. Might just loosen it enough to be removed.