Very nicely done Bruce 
Who did you hire to help with the flue removal? 
I enlisted Ang (my wife) ...😄 & she wasn't excited by the chore 🤨 in all actuality I should have had 3 people. 1 to heat the bottom , 1 to place both hands on the boiler (I tried to clamp it down, but very difficult without harming it) & then myself to heat the top & extract the flu pipe. It's a real PITA all the while keeping a heat sink on all the other things that you don't want unsoldered 🥴