Some new frequency modules also allow you to now dial in the frequency virtually eliminating the frustration of not being able to fly if someone else is also on your frequency. Adjustable servo arms are available for some radios which can be made shorter or longer. Servo gears can be damaged in a crash and the loss of just a few teeth can render the servo useless. A replacement gear set lets you fix the servo yourself. A cracked or broken servo case can let dirt, water or fuel into the sensitive electronics of the servo.
Most manufacturers offer servo plugs that are compatible with their radio systems.
This allows you to adapt other brands of servos to your radio system or repair damaged plugs. Chokes or radio noise traps may be required. Two servos can be plugged into one channel with a Y-harness. The two servos will then operate simultaneously. It is most often used in areas where the strength of one servo is not adequate.