I have an H Pieper hammer double with twist bbls in a 1-piece steel block (Mono-Block). The tubes on this bbl set are threaded & soldered into the block. I would not expect any failure here. The tubes actually extend only about half way through the block, thus the rear portion of the chamber is cut into the block with the forward portion being in the tube.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra