Your basic concept seems sound; have a set of "butterfly" type handles fold and enclose an adjustable wrench head instead of a plier head. You've made three different examples that prove it can be done. I wonder why, with the proliferation of different multitool designs that are coming out of China, we have not yet seen something similar from over there?
I'm familiar with the wrench tools that you obtained the adjustable wrench heads from; they are both "fixed head" designs that do not fold up into a very small package. All of your tools condense into a shorter (although wider) unit for easier carry, correct?
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