I just wanted to add this after reading this thread which is very good and very informative. I know there is already a disclaimer here but unless you know what you're doing ( meaning, a lot of experience) with a seer and the hammer hooks do not touch them. It can possibly ruin your life, and those around you., by turning that safe pistol into an unsafe pistol.
With that said when you're doing polishing never try to remove machine marks , you just want to smooth and Shine the metal . removing machine marks can take those parts beyond the tolerances they were created for. Ask me how I know I had to get replacement parts from cgw because my P 07 no longer functioned properly. JMHO
Edit : just because you "CAN" do something doesn't mean you should.
A man's got to know his limitations !!