I usually use an .040 solid music wire running through a nyrod tube. It will handle reasonable routing without binding.

I solder on a threaded end for a dubro ball link.

Served me well for many years.

I have also done the throttle pinch-off using a "U" shaped end on the same rod, and pinching against the firewall or backplate mount. But expereince showed that I was much better off using the carb to shut the engine down.

Bob Brassell