Bring the Samophlange Manual to Rilli Greasygob in Orgrimmar.
I think I can fix the samophlange, but I'm going to need the user's manual first. When I was in the Venture Company I had a rival, Boss Copperplug, who hoarded the secrets of the samophlange, giving out small bits of knowledge on the device to those he trusted. I wasn't one of the trusted few...
Boss Copperplug used to stay at the Boulder Lode Mine in northeastern Barrens. Get the manual from him, and if he's given pages from it to anyone, you'll have to collect them too.