So how are the new HW star nut barrels actually held in?

[look no hands]

So, what little project has Young Pete got in mind, then?

Well then young Tone, I'm still thinking what to do with this .25 barrel off cut, not sure I want to destroy the Exocet breech block as they are hard to replace now if all goes wrong, where as HW ones are two a penny and if they are easier to get apart, then may be something can be done.

Pete