Thank you for opening this thread, I am finding this most intriguing!
I don't want to detract from above but my next question:
I assume that is the grade of metal maybe even a superior grade yes/no?
I think I would like to try something along these lines. I have turned some ally at the factory by hand before I got the sack.
Its awkward on a wood lathe but not impossible at all. I would have to use standard taps and dies as that is all I have access to.
My thinking is to tighten up to a O-ring thus reducing the number of turns and adding some grip to retain it.
Has this been tried tested and proven and I am wasting my time?
