XK K120 RC Helicopter Spare Parts: Metal server upgrade

K120 method: 1. Shorten the connecting rod, you can cut it and bend it, or you can cut the thread at the end of the connecting rod directly, leaving a little thread about 0.5mm and you can screw it in. 2. Use the innermost hole for the steering gear arm, cut off the outer one, and use an extended screw to fix the steering gear fixing bracket (one extension screw is provided for all K120 reverse servos purchased now)