When an axle nut is stuck/jammed especially like this one is, unless you have real good brakes, the car could be induced to move on you... not safe! If you put the car in gear you to hold it then you can/ can also put the drive train components in jeopardy... not good!
http://www.mooreparts.com/classic-volks ... oval-tool/
This is an old tool design, which I have used many times, and it does work... up to a point (never seen or heard of one failing before). In my opinion it is safer than breaking the axle nut while the car is on the ground; I have tried that method while dealing with a stuck nut or torqueing a nut before. When you put it on the brake drum using the lug nuts; and doing it correctly; e.g., pointed in the correct direction (it is good for both 4 and 5 lug drums) you are using both it and the weight of the car to your advantage while you try to remove or torquing the
)(&*^%*$*&^%(*&^ axle nut on/off the car's axle/stub axle.
I have seen guys using a 4' pipe slid onto a HD breaker bar and even longer pieces of pipe with several guys putting their weight on it. I have seen a breaker bar slid into the hole on the unit that is designed to be whacked on and the unit was whacked on with loading applied to and via the breaker bar. When the nut finally releases or something breaks then there is a lot of embarrasses faces as they get back off the ground.

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