Sure - so long as you're careful, and don't remove much.
These are finished as an assembly to ensure a proper mating of the surfaces - but a little smoothing is easily accomplished, so long as you don't get carried away.
If they're finished evenly with the steel frame, and polishing'd remove too much brass - then 'burnishing' is better, and you can accomplish that by smoothing any sharp/rough edge with a screwdriver shank.
Good Luck!
Vaya,
Scouts Out!