Ah, a chance to enlighten an idiot.
A Darne is a monoblock design, the originator of the concept. Instead of a soldered/brazed/collection of the barrel stubs, under rib, top rib, solder, braze and whatnot that was included in the hack-sawed remains of your Purdey sleever, there is a solid, machined chunk of tool steel. This can be heated and repaired, over and over, pretty much forever, since it is one piece.
Sleeving, involving a hacksaw, like your gun did, isn't how a Darne is repaired. The silver solder is heated, the barrels someone like you damaged when you fell on them, backed the truck over them, or, whatever, are removed, the monoblock cleaned, and brand new tubes fitted and re-soldered.
Sleeving, as it were, doesn't happen to a Darne, jOe-make a note of it, would you?
Again.
Best,
Ted
