Can you solve the Rigid Plate on Springs Puzzle? 4

[cal91]

I'm designing hoisting/rigging/spreader bars for picking these large modules. They give me the attachment points to the modules and where the center of gravity is. So I just need to figure out how much force is going into each pick point. Theres are large modules with 12 pick points each, and I made a spreadsheet to find the forces at each pick point. It's set up similar to a rigid diaphragm distributing shear force to vertical elements, but it's got added complexity of being two dimensional instead of 1 dimensional. Balancing the moments in the two directions interact with each other and I'm trying to figure out how to set it up correctly so that summing the moments in both directions equals zero.

I simplified the problem into this little puzzle. I'm laughing at myself because at first glance this seems so easy to solve but I'm struggling.

See if you can solve it. I know I'm having a brain fart, but I'm gonna be stubborn and not come back on until I've solved it myself.

 

[skeletron]

I've been a part of lift studies that pushed the upper capacities of Crosby shackles. It comes down to rigging equipment, skill of the lifter, and cranes on site. As Lo points out, if there are spreader bars or snatch blocks present the distribution can be argued to be a little more even. But there was always a good measure of safety gravy in case something goes awry. There's a hundred ways to rationalize the problem, it depends on your confidence and team but in the end it really should be the safety of everyone involved that takes the cake.