Sam2 – I find it far more likely that the 6 hours is the To’us, as the mistake of printing ‘Shalosh’ as ‘Shesh’ requires only that the printer miss out a lamed, whereas the reverse would need the addition of an entire word as well as the letter ‘lamed’ (and the invention of a rashi). Occam’s Razor says that R’ Yerucham had a rashi we do not (which is not at all uncommon amongst Rishonim) and that a printer missed out a letter. It requires fewer assumptions than positing that a printer a) put in a letter that was not there, b) put in a word that was not there and c) invented a rashi that was not there. I have also never heard of your cherem and the fact that the ‘gimmel’ girso appears in all modern defusim surely would imply that such a cherem does not exist. I would like documented instances of printers dying after printing it, please, rather than just saying it.
PBA – Thanks for the Maharil, I guess I must have been misremembering. However, I do disagree with your interpretation of the Chayei Odom as he refers to them not simply as minhogim, but as ‘dei’os’. This means, to my mind anyway, that they are based not simply on practice but on actual shittos. When I asked my Rov he said that mistomo the Chayei Odom is referring to R’ Yerucham. I’m still trying to chase down that Mabit for you, by the way…