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So here's an actual Lego question. You know the little robot arms some minifigs have? They only ever have it on the right. I don't know why, but it's never on the left. It isn't even angled like a normal minifig arm. What's stopping them from ever moving it over? Is there anything stopping anyone from just popping it out and swapping it with a left arm or is it a weird nonremovable piece like those old spring legs?