I have a 1908 Remington Model 11 Shotgun. I have it apart for cleaning and replacing broken parts. I found some damaged threads. The damaged threads are the ones described below. I would like to repair the threads but to do that I need some thread information. On the Remington Model 11 Shotgun, the Spring Action Tube (Item 8) screws into the Receiver (Item 7). What is the screw thread designation? In other words, what size tap or die? Any help greatly appreciated!