About 11.1". I'm also awaiting my stubby 14mm PVHES. I've decided to add an extra o-ring to my Solo also, as the stems could be more secure, and it'll be more natural to remove the PN WT without holding the stem in place.
Good call. And I'm sorry I didn't say it before, but congratulations. Gizmodo has a huge audience. You guys definitely deserve all the positive press you get. Don't own a Pinnacle proper, but your PN WT is about the best thing to happen to me since vaping :)