I'm Stumped

[Bill Houghton]

Any one tried to "jeweling" or engine turning with one?a flat pad with a fine grit like lapping compound should work.
I use a round wire cup brush to do aluminum.

Interesting idea.

You could get a kid juked up on sugar, and get him/her to working.  Me, if I decide to engine turning on some metal, I'll probably set up a jig on the drill press.

[papadan]

For those who couldn't afford the highfalutin new fangled mechanical ones, the fire starter type worked.

Not quite that fancy or for a model T, but I sure used this type a whole lot of times. Back in the 70s on 4 cyl. flat head forklift engines, I used those a couple times a week.

[Northwoods]

Papadan, I bet you--or perhaps your old daddy--have used one of these:

https://www.ebay.com/itm/Vintage-Carborundum-tin-grinding-compound-transportation-collectable-advertising/264234627355?hash=item3d859c711b:g:jg8AAOSwUTZchmJW

I found it Sunday in a Hinsdale G20 ratchet/socket set.  I'm guessing it was quite a trick to make a two-compartment tin back in the day (fine and coarse).