There is no quest giver fo this item. The real quest is Trep's Shopping list. After finish this quest he says thats all I can give you but you combine a:
Cloclwork carapace
Metal rod
Gnomish bolts
Firewater
and Grease ; in a tool box you should get something nice. The something nice is a Wok :)
Now what its used for is still in question still working on finding out what that is.