These are images of cut #4 on the next day, still standing, which proves the through-bolt method works well. I was incorrect in thinking that the locking mechanism failed. It did work, but is quite mangled as a result. Going forward my strategy will be cutting irregular shaped pieces (think L-shape) and letting part of the ice rest on the top surface in addition to a chunk still in the water. Another option is a "lasso-method", which would require someone to connect a chain (looped over the header of the gantry) to the slab of ice as it reaches the top of the gantry crane. I think this would actually be doable since the winch is moving very slow as the slab is pulled up high.
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