Thomas G. Marshall wrote:

Well, I checked that at RS, and they have no way to do it, and I'm in the
middle of nowhere, so It'll have to be internet.

Check again, though the RCA plugs that fit coax require quite a bit of
soldering for a good connection. RS does sell them.

Contrary to popular mythology, the best connectors are metal to like
metal. Plain tin plugs in a plain tin jack will work as well as
anything. Monster cables may look cute, but they don't work any better
than soldering iron specials that only cost a few pennies.

The mark-up on cables is even worse than the 300% mark-up on jewelry.