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@welpeur
no prob .. i hope it helps, it had actually been confusing me before too but i hadnt thought about until you stuck the diagrams up .. i don't actually see how their square design is an improvement on a round shackle anyway as if you've ever tried to saw through something then the hardest bit is always getting the initial 'groove' to start cutting into and a corner is a perfect for the job as you only have to scratch it slightly to have an indentation to start working against .. seems like 'verbal' technology to me