I know about this because the subject came up in a discussion, some years ago, (with Roger Crosthwaite) during a session. I have (somewhere among my 2000+ books/notes etc) Francis's notes. (I knew him fairly well, btw.) Like the Jacob Daley notes, they really are just notes. If I recall correctly, he didn't say how you got two Aces atop of two piles, but he did say something like 'pick of two Aces to display, and then use misdirection to pick off the next two Aces but place them atop the other two piles.'
Sorry I can't be more specific, but when I have time - I'll try and search them out. I don't know for sure about Pentagram or New Pentagram, but most of Francis' stuff was in there.