>Anyhow, an old fellow told me that shops used to hire young kids to climb around up in the rafters, keeping all the jack shafts lubricated at the bearing blocks. The way they climbed around up there inspired the term "grease monkey". True?
That's the story I've heard, too. When line shaft was in its hey day, there were no child labor laws. During the Civil War, the Ordnance Department hired children for any number of jobs, and they were expected to put in 12 hour days. So the story might be true.