Erm I have I just used it to undo the nuts too, and intend to use my special tool to do up lots more nuts, it hasnt cracked or stretched so I dont see why not?? If the nuts are made that size then they must be like that for a reason, no?? So i guessed I didnt have the right tool for the job, not they specced the wrong size nuts for my socket?
Get a socket on a grinder, or Lathe if posssible "bill"