I have an old 70s bike with a threaded fork and a quill stem (of the expander type).
The stem was completely frozen and even the bolt didn't move one bit. After turning the bike upside down and soaking the stem in WD40 and the like, the bolt finally moved; however, the hammer trick for making the stem to move as well did not work. After messing with the bike some more, I'm now in a situation where I have both the long bolt and the expander cone out, but the stem is still stuck.
I've soaked it in WD40 again, and the oil is yet to come out of the other side (it's only been one hour though).
I would appreciate any advice on what to do next.