BTW, and it's a pretty strange story, but I actually used one of these things one time. The pictures don't show the most important piece - the thong that holds it to your wrist. You really heave on one of these thingies and it gets a little hard to hold onto.
I made a couple of atlatls for my (college age) kids for Christmas a couple years ago. We were standing in front of the house on Christmas morning trying them out, when a whitetail doe just randomly walked right in front of us, in easy range, broad daylight. Nobody took a shot, we weren't too accurate with 'em yet and didn't want to stick one in the wrong part of the deer and have it go off injured, plus lose the dart.
Anyhow, I didn't know about the thong, sounds like a good idea, should perhaps even allow for a little more torque. Maybe I'll add that feature to them, see how it works out.
But what is the strange story?