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You are incorrect, as R Y. H. Henkin’s reports about his grandfather are taken seriously by many mainstream poskim. See for example http://www.torah.org/advanced/weekly-halacha/5762/vayigash.html where Rabbi Doniel Neustadt, a rav who has a halacha coulumn in the Yated no less, quotes him matter-of-factly regarding this very psak.
As for Rav Solovetchik, yes the quote says he only allowed it in times of duress, but who’s to say that charliehall’s situation does not fit the criteria for that. That is for a competent rav to decide.
My point is that you cannot simply dismiss charliehall’s claim that these great poskim did indeed, at least in some circumstances, permit a mechitzah of only 10 tefachim, for it is backed up by reliable sources.