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Uhm, if you're not a framebuilder, I highly doubt that you know how to properly 'disassemble'
What I know is that everything's fine as long as you keep the temperatures below a certain level (dark red for Columbus Niobium material) and that one shall always heat up the lug and not the tube itself, evenly all around without generating hot spots.
Feel free to share your magic extra knowledge.
Uhm, if you're not a framebuilder, I highly doubt that you know how to properly 'disassemble'