Are you saying in your first paragraph, that something like a threaded disc was installed up against a minimal shoulder present after the 5/8-24 theading? Welded, soldered, or pinned or such? Potentially trimmed on a lathe to be very concentric with the bore? Appreciate it as in your pics before, it just looked like a shouldered adapter.

Last edited by MtnBoomer; 10/30/19. Reason: Clarity

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Holocaust Deniers, the ultimate perverted dipchits: Bristoe, TheRealHawkeye, stophel, Ghostinthemachine, anyone else?