Very Small Air Chisel/Hammer Chisel?

[Derek Arita]

Figured if anyone would know, one of you would. I restore vintage alarm clocks. Many of the clock cases are made of brass or other metal. Anyhow, I've been working out all the dents from inside the case. I got the idea that a small air chisel would be perfect for the job. The chisel would have to be 1/4" to 1/2" wide. Obviously, the hammer action would have to be equally small and controllable.
I'm wondering if anyone has knowledge of such a tool?

[Bill Neely]

Check out the Harbor Freight planishing hammer. The dies are probably too big but you may be able to make some yourself or buy them on eBay.

[Jim Finn]

I have a "Master Carver" hand piece that has a mini jack hammer action. It is meant for carving wood. You put various tips in it to carve with different shaped tools. I imagine you could make a blunt ended tool tip for it and use if for what you need.

[Jerome Stanek]

What about a tattoo gun

[Derek Arita]

First two look like options I can look into. The tattoo gun might be a bit too gentle in the action as the cases are a little thicker than tin cans. Thanks!

[Bradley Gray]

You could check a jewelry supply site - I have a jeweler friend who uses one to hammer bezels for stone setting.