Clever use of a pipe plug in a fitting.!.! I like that idea and will probably use it somewhere in the future. 8-)
Back in the early 70's I used probably hundreds of compression fittings and never experienced any failure(s). And we would install them in all sorts of applications. Brakes, trans coolers, fuel... it didn't matter. Then by the end of the 70's I guess it became a huge taboo... no one ever said why or what caused this but it just seemed to spread like a rumor. Don't use compression fittings! I still use them on my own stuff when needed, but never on a brake line... I guess age brought wisdom? LOL Nice write up as always.