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I finally did manage to convert that Minolta MD 58/1.4 to EF.
It was a tricky process, mostly trial and error since you can't predict how much you need to file down some parts in order to reach infinity focus.
I couldn't have done it without this guide: https://web.archive.org/web/20131026030722/http://www.cogitech.ca/Rokkor/index.html (thank God we can travel back in time, because the site doesn't exist anymore)
But all in all, I think it was worth it.