Ok I figured this exploit out today and I know that there were other ways to do this but this is the only one that is currently working that I know of.
It only works if you have a hunter and you need to start the questline with Ancient Petrified Leaf - Item - World of Warcraft the only part of the quest you need to finish is A Proper String - Quest - World of Warcraft once you get the sinew from any black dragon in burning steppes go turn it in and you should receive Mature Black Dragon Sinew - Item - World of Warcraft which gives you the Feat of Strength.
Onyxia :: OnyxiaFoS.jpg picture by karzakk - Photobucket