hereford,

Check Mark11's comment above, pinning in the file will make "gouges" that "polishing" won't get, they may have to be filed out. Loading the file with chalk helps, otherwise you might have to clean it after every stroke. A cartridge case with the neck hammered flat is handy to remove "pins" that resist a file card or instead of the card when there are only a couple pins.
Mike

Last edited by Der Ami; 11/22/20 07:16 PM.