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PhilDAS
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