I just found out that there is a one handed version of the pass. Erdnase one handed shift, I believe. Is that the only one handed version of the pass?
No. There are several. Of course there's the Charlier Pass, but in nineteenth-century books like Sachs'
Sleight of Hand, Hoffman's
Modern Magic or Robert-Houdin's
Secrets of Conjuring and Magic you'll find several alternative one-hand shifts. If you go through old magazines like the Sphinx and Mahatma there are a few variations on those themes. Then moving into the twentieth century, the Neal Elias one-hand shift is published in
The Vernon Chronicles Volume 1 as the Vernon One-Handed Shift, and there are a couple of ideas in Henry Hay's
Amateur Magicians Handbook and Camille Gaultier's
Magic Without Apparatus. Richard Turner, Kim West, Chad Nelson have one-hand shifts on their respective videos, as do Jo Sevau and Richard Hucko on their
Subtle Concepts DVDs. And, to top it all off, I've got a few of my very own!