Kevin, I completely agree that plastic is risky for throttle and choke be it gas or glow. The biggest issue is not so much the ignition or radio noise but rather the noise the metal can create itself at certain vibrations. I use the bolt on ball link type as seen in the pic, they are bullet proof. I would also like to suggest you get all these type things done prior to prime and paint in case something needs adjusting so as to not risk scratching or other damage.