The problem is deciding what you are unscrewing. Think about this (it occurred to me last week): You drive a screw into something by turning the screw clockwise and extract it by turning counter-clockwise. If the same thread patterns are transferred to locking RCA's (plug body as screw and barrel as "something"), then turning the plug body clockwise would tighten it and counter-clockwise would loosen it. But you can't turn the plug body because it's got a long cable attached, so you turn the barrel instead -- so loosening the locking RCA is like removing a screw by holding the screw in place and turning the object it is screwed into. Intuitive? Hardly. But it would allow them to use existing machine tools to thread the body and barrel.

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