So I bought a small box of tap wrenches, and it had a dollar general dial caliper in it, as well as this. The guy had no idea what idea it is, and neither do i, he seemed to think it had to do something with machining
The "roller has 2 textures and 3 different sized wheels that thread on.
Yep, these rasp used to be used in my field for modifying the inside of prosthetic sockets, back when they were made of wood. I’m not sure if they were exclusive to our field or not, but I could probably find out what they were called in one of my books from college or one at my work if anyone is really interested.
We still use something similar , but it’s attached to a big router with a long arbor arm.