Throttle servo. Throttle over-ride. Hook up, no set screw needed at the center of the arm pin. I have secured this in the past, not needed. You can adjust the spring's, out and in, when too much stick is used, as in the old day's, this will prevent over riding on the servo, affecting the throttle arm on the carb, etc. This can also be used on the nose gear steering arm. With modern radio's now, we can use travel adjust. This is just a safety valve.

Stopped in the shop on way out to get the morning new's, picked up one of the package's for the over-ride. These are still available at your LHS, or order on-line. Few picture's one of the Intruder's in flight.

Vince