It is critical that the breech face of all semi auto pistols be polished like a mirror, as well as the feed ramp.  Polishing compound such as Flitz and Simichrome can be used.  Brushes can be replaced easily.  'O' ring can be used on bristles, but are not necessary.  Clean this equipment with Birchwood Casey Synthetic Free Cleaner.  DO NOT EXCEED 10,000 RPM. Shaft can be cut shorter.  For more information call Teddy Jacobson of Actions by T: 281.565.6977.  He has been using this tool for many years.