I think that that is true, but I can’t verify it. Lots of McWhyte wires flying on Pitts and other airplanes.IIRC ALL of the McWhite flying wires were cut threads?
we've been producing Streamline Flying Wires (AN671-676) and Tie Rods (AN701-706) for almost 15 years, all but the earliest ones with rolled threads. The advantage of rolled threads goes way beyond the strength issue. Cut threads leave a stress riser at the shank end of the thread which on a tail brace wire, unsupported in the middle will vibrate and eventually break We've replaced many tail brace wire which started out with cut threads. The rolled thread does not leave a stress riser, as the heads open at the shank end, leaving a nice smooth ramp.Those are cool tools, but they only seem to be available in metric threads. Kind of pricey too. I'll have to look around and see if any come with standard sizes at a reasonable price.