Hi folks, for many years I've had and shot an Ideal Grade 16 gauge, 1929, with I know and believe with two and nine sixteenth inch chambers. I've shot light two and three quarters inch loads along with "heavies" now and then. As I'm well along in age, I'd like to have the chambers opened up. I need advise and recommendations as to this procedure, and, recommendations of the most qualified and recommended folks to perform this. Thanks, Jay