Your right. The non locking hook is wrong. Our cranes don't have a ball. The cable isn't fixed but runs through 'a pulley'. In that setup we aren't able to secure our big ring.Looks like it was a nice set up. My only criticism is your TIP
The hook with a non locking latch shouldn't be used to tie in to. I also don't like to tie in to other rigging gear. A separate ring in a locking hook is preferred. If you are limited to what the crane has as I think was the case here you should bring your own set up to tie in above the down haul weight. I have attached a picture.
Why doesn't your cranes there have a ball or haul down weight? That hook can't be heavy enough by itself to drag the cable out. You can install a shackle on the cable, above the weight, for your tie in method.
Last fall Chuck, no worries on that we were doing whole trees with a long round eye sling so weren't any issues, like I said earlier he had that big block on for lifting heavy objects and squeezed this job in between that one. Don't normally do tree work with that.I'd sure hate to drag that big ball through limbs.