So these "dovetailed" lumps (or is it just one lump?) are not integral to the barrels? Just one piece right? Keyed in there between barrels and soldered? We should have just one word for everything in this world; such an assist to understanding! And we should note well that what you cut off and throw away is two (or perhaps four) altho looking like one and what you keep is also two (or maybe five or six) altho it looks like one except in the case of monobloc in which case there are three which look like two OR one depending on your pov. Get the torch!

jack