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@Egghead
@AntSel
The 21.15 mm stem diameter or steerer inner diameter was a BMX standard that was also on early mtb and bikes with one piece cranks:
https://www.sheldonbrown.com/cribsheet-headsets.html
I have the same issue: I got a cheap old fork that was advertised as 1", not knowing there was a different kind. I just dremelled / filed the stem down to fit which means I will probably die a fiery death.