I finally found the large photo of these slick problem solvers and after I recover from outpatient lumbar laminectomy (hint, have a neurosurgeon read your fresh MRI) I'll make a couple with wing nuts the size of cylinder fittings so one wrench gets both and besides being a back saver I could load cylinders easily with a winch or tall jib crane and handle much easier then hugging them. Of course ID will vary by cylinder but flat bar is easy-ish to bend and work with.
The incentive these fellows had to not drop poison gas cylinders in their own trench was considerable:
The incentive these fellows had to not drop poison gas cylinders in their own trench was considerable:
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