Nice! I'll keep that in mind. I was also reading up on another way to reattach the cast piece to the tube.
Heat the "cast" piece up with a torch, do a deep penetration run with your mig, peen it while it cools, and then a final weld, peening it as it cools. All the time keeping it hot with the torch. I believe 400 degrees is the proper temp. I'll see if I can find it.