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@jetski
tynan, "if there's a bit of a stem fitting into the steerer snugly, then there is no other movement possible for the whole thing but up/down the steerer tube"
Maybe it's a problem with my vocabulary, but it can't be too mysterious to understand what I mean? Imagine: tube width: say constantly 22mm, 'stem' length: say 45mm, 'stem' width: say 21.8mm, bolt length: say 60mm, 10mm high starnut at the end of that bolt.
Come on, how on earth would the starnut experience a relevant amount of shear force in this setup?
EDIT: in the end, the carbon-suitable ahead expander will probably do the trick sufficiently, so we should stop worrying about the "expander or starnut" question as it is something that everyone can chose afterwards, it's not directly part of the actual design anyway.
It would be more interesting how far the variations between classic steel track forks are. (hole diameter, diameter constancy and radius of the lower fork crown arc). For example, I found one expander that varies between 20,5mm to 25,7mm which is quite much and should be sufficient for most forks?
Could anyone measure their lower track forks hole, please? Thanks.
jetski