so just to add a bit of confusion, about 30 years ago, I bought this tang-stock mortice drill, which has seen use-at least two repairs on it, and the clamps definely look black-smith made. I surmised it was used by a door hanger to install full mortice "skelton key" type locksets around the 1900's, I tried it once, and then I got the Stanley lock fortice machine (circa 1950) which see's little use, and is an upper-body work-out to be sure.
So I thought I'd share the older piece of history.