Tom Kunich wrote:

By the way - It is NOT a "cap screw". It is as I said, and Internal
Wrenching Bolt. Now they are often mislabeled and you'd find a Cap
Screw in the wrong bin.

I had to look up your laughable term to see if anybody else had heard of it.. It turns out that an "internal wrenching bolt" is a Jim Crow-era NAS (US aviation industry) designation for a certain kind of cadmium-plated fastener which is by definition not metric. While the decorative head on a craptastic linear-pull brake cable fixing screw is superficially kind of similar, it's not an inch-sized, cadmium-plated, ludicrously expensive airplane part. So it's not what you say it is.

But feel free to keep doubling down.