I didn’t mean to imply that the cartridge shown was one made by O, K, or H, only that it was a 334 OKH wildcat. The Fat Mac flash tube was originally made to be a press fit but was later changed to the screw in unit which proved to be much stronger.
Charlie O’Neil’s patent for the forward ignition cartridges shows three different methods for installing the flash tube. None of the three involve soldering. (Just off the top of my head I would think soldering would be the least attractive alternative, for a lot of reasons.) A screw in tube, either by itself or a combination tube and primer pocket, is the most common and was also used by Rocky Gibbs.
While on this subject, I’m still trying to identify both the maker and user of the flash tube cases shown in the last JOURNAL.