I'm not sure where the best place to ask this is, but my question is basically could Tony, with a lot of time set aside and possibly some extra assistance, manage to reattach Bucky's arm? With the arm still in one piece, he's not actually rebuilding new machinery for it and he is capable of building crazy things from scratch in the comics with very limited resources. He's responsible for prosthetic limbs, robots, and armor parts of all sorts so he would definitely have the experience with an arm similar to Bucky's. Regarding equipment, he could work by hand and it would take a long time, probably hurting himself in the process, but with makeshift tools he could do something like using a stray scrap of metal to tighten bolts and strip and reconnect wires by hand, that sort of thing. I know it would take a long time, with days devoted to the effort, but with Tony's kind of crazy mechanical experience, would it be possible to eventually make that work?