If you are having bad luck in Storm Peaks, try Borean Tundra.
I say go kill Flame Leviathan and MAYBE XT. Slavage them as they have the highest chance to drop it. Then farm the mobs in Storm Peaks if they give you nothing. Shouldnt take many people do down those two bosses.
I remember farming for my Jeeves Pattern. I farmed that bugger in Borean Tundra for the first time I hit Grand Master Eng, low and behold, I got it on the 3rd salvage!
It took me atleast 48 hours of farming to get mine >.> Don't give up!
Hi Sephurik