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They'd (probably) be gripping the faced ends of the shell, not the threads: https://wheelsmfg.com/eccentric-bb-for-pf30-24mm-shimano-cranks-black.html
A Bushnell would press outwards(ish) across a much wider section of the shell, mostly in between the threaded ends, but a Bushnell needs a 54mm shell: http://www.bushnelltandems.com/eccentric-build-specs.html
Emyr
PhilDAS
Yeah sure but you won’t be able to get push fit cups to sit nicely or grip on threads right? So I figured maybe someone had done thin cups which thread in and house the eccentric part which then presses up against the thin threaded rings in the same way the normal pf30 ones do inside the bb shell. But I suppose not.