Originally Posted by
Kontact
......Why wouldn't an aluminum frame get galvanic corrosion from contact with the steel headset race?.....
Because, unlike the raw steel of a seat tube, steel headsets tend to be chrome plated.
Besides, the differences in engaged surfaces, ie 10-15mm vs 60+mm for seatposts and the ease of knocking out from the bottom argue against the likelihood of sawing to remove.
I have no competing theory except that it was either intentional or accidental.
Early on, I offered a fix. That's how I deal with stuff like this. I focus on solving the problem, and leave fanciful theories on who might have done what to others.
Sometimes, I do explore questions of how stuff goes wrong, either out of intellectual curiosity, or if I think there's a benefit in knowing.