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Typically, wires don't stretch, but the loop and ferrel ends can slip, causing same net effect. This is not an overt problem (avoiding the given the situations you mention), and was not abandon until the late '20's that threaded tie rods replaced wires in production a/c. Travel Air (the Witchita Fokker) employed wire braced (w/ferreled ends) steel tube fuselage and is rather stout allowing huge engines and unlimited aerobatics.
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