Hi Brad, you are correct with the comment regarding preventing metal contact between the radio equipment and the engine. I always make sure that I have some kind of insulation. In this case, the cable used as link to the servo is covered with plastic (the cable is from the Dubro pull-pull set), and I am using plastic horn on the servo.
The insert I made is to act as a bushing. The sides of the clevis still contact metal-to-metal with the carburettor, so the bushing could not be used as insulator.
As a side note to the topic, I am curious to know how big is the R/C community in Port Hedland?
So far I had no opportunity to visit up there, but you never know...
Cheers,
Eran