chubs
Guru
In your first picture there is a paper in the background that looks like it says something about "flex shaft attachment" or something like that. Could it be some kind of quick change adapter for like a drill or grinder or whatever? Maybe the spring end attached to a drill spindle and the small end held a reamer or burr file or other interchangeable tool??
Possibly holds different sized hones?

Possibly holds different sized hones?

