CTM, I was at that crane course and did know what you were talking about but didn't find the choke that noteworthy. I "invented" it on my second crane job ever when the chokers I was using at the butt were a smidge too short. This is the only situation I can come up with where it would be useful but I could be missing something as I'm fairly new to crane work. My main turn off on this choke is that your not getting the benefits of ( more )balance or strength, which IMO, is the only reason to ever use two chokers. Like I said, I'm new to crane work so if you ( or anyone else ) could offer more insight I'm all ears but I can only see it coming into play when your chokers aren't individually long enough to circle the butt and reach the hook.