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I realised it would be the easiest to sweat in a shell and then cut threads into it.
Wouldn't it be easiest to use a shell with threads already there?
M_V-
So this is the conclusion I came to, but I want to ensure the threads are co axial, and the internal diameter of the shell is currently the major diameter of the threads, meaning I would have to braze in just threads, which might be impossible. So my current plan is to bore the shell on both sides in the mill, and then either braze or loctite in steel shells, bore then and then cut threads.
Ph1ll1p
Thinking about the BB shell, I realised it would be the easiest to sweat in a shell and then cut threads into it. I'll have a crack and some more measurements to see if it's going to be possible.