Iron; How did they make it?

[Astronowanabe]

No, sorry, you will just have to keep looking, good luck

[Astronowanabe]

a four part blog post (last part out later this week) from

note: it you want them in order
part one is lower on the page than parts...

[Astronowanabe]

If they did not want to be heating the whole thing they might have forge welded it from the bottom up
then they might only have to keep the top...

[Astronowanabe]

I've been ham handed enough to snap handles I might not have if they had been fine thread, but that was 1/4-20 I think and clamping

[Astronowanabe]

Most any machine that allows me to rearrange electrons and sell the resulting patterns;
but that is probably not what you are looking for.
...