ORIGINAL: Wyvern Crossbow
They mentioned that you can hold back the stringer with one hand and operate the DFI and the trigger with the other, but I think that would be harder to hold back the full weight of the bow with only one hand. Not sure if this helps
Wyvern
On my Exocet I can easily hold it with one hand when I uncock it. I uncock it this way after each hunt now instead of carrying a target or using an old arrow. I was initially reluctant to try it but one of the states I hunt legal hunting is at sunset and if the xbow is cocked it is considered a loaded weapon so you are consider hunting. This allows me to hunt until sunset, uncock the xbow, and head out of the woods. There is a video on the excal link that shows how to do it. It is at the end of the "Rope Cocking Aid video"
Bob