I am advised by the cluey and experienced guys at my club that metal to metal contact in glow planes is a no no - ie the metal throttle control rod mustn't attach to the metal throttle lever on my OS61, as it will cause glitches etc.
However, on thinking a bit about it I don;t see how this can happen as there is no potential difference between the motor/throttle lever and the control rod - in my current case the other end of the rod just attaches to a plastic/nylon/whatever lever on the throttle servo.
I am not sure that electricity can be generated just by rubbing two bits of metal together when there is no potential difference between them
I note that in other situations - eg mobile phones in cars, car radios etc there is LOTS of metal to metal contact surounding these devices, and is not a source of interference (ignoring the common problems of earth loops etc which are s different matter)
So, I am thinking that maybe the problem doesn't really exist - in the situation as I have outlined above - but I have been wrong before, so....
If you believe it is a problem I would appreciate a short explanation of how the interference is generated, and whether your view is based on personal experience or information gleaned elsewhere
Cheers and thanks in advance