No Lathe Needed, No Need To Remove Barrel From Frame
Power "trick-of-the-trade". Use to adjust barrel/cylinder gap,
square the rear barrel face and eliminate high spots. Four Sizes:
.540", for Ruger Security Six, GP-100; S&W K; Colt
Mk III, Official Police; Charter Arms; .560", for S&W L;
.625", for S&W N; Ruger Blackhawk, Super
Blackhawk; .687", for Ruger Redhawk.
Big Book Catalog, Issue:66, Page:505