And if you have boogered screw heads you need to make a swedge block. You drop the screw into the correct base hole and using a ball peen yu tap the metal back into shape and re cut the slot with a needle file. Then polish and re blue. It doesn't take long and really maked the gun look 100% better. My swedge blocks and bench blocks were made years ago from old sad irons that I got from my grandmother. I polish my screw heads by chucking them in a mini athe and pushing a soft pine board covered with emory cloth against the head, then either cold blue or nitre blue them.