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Not quite sure what you are asking. The red suspension arms that you have pictured are a very bad design unless one side of the arm is reverse threaded. Otherwise you wouldn't be able to lengthen or shorten the arm while it was on the car.
Those red rucas you definately would not be able to adjust while on the car. YOu would have to remove half of it to spin it and change the length.
Nothing wrong with the way most arms are designed (SPL/nams is fine). The larger diameter threaded part is hollow and the smaller diameter section fits inside. All that matters with suspension arms is strength in tension or compression.
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