BLUE ARROW D05010MG Minimum Metal Gears Servo for Walkera V120D02 S If you received the servo can not install on the rc helicopter, please follow this steps:1. Installing swashplate servos, cut the ears;2. Machining body, circled with a knifes resection;3. Do not cut too much time, try to put up the servos;4. Like this one:5. The right servo also do the step before:7. Prefect!7. Pay attention the front & rear steering position, keeping the vertical steering rod;8. Below tail servo installed, this steering ears must stay, I hope you would not have been cut. Please cut circle place.9. Started drilling holes;10, Tighting screws;11. Set the rudder machine, if you feel the tail is flexible you can reduce the size of the amount of control in the tail rudder machine;12. Completion figure: Description: Plug: J Plugs Cable Length: 160mm Weight: 5.8g with the signal line, rocker, screws Dimensions: 19.6 x 8.0 x 19.4mm Motor Type: Coreless Gear Type: Metal PWM signal is 50HZ, high time is 1000-2000 microseconds Basic purposes:1. Light remote control rc helicopter 2.EP100/200 CCPM Electric Helicopter 3. Light Remote Control Car Package Included:1 x servo (only)1 x the servo arm 1 x screws 1 x manual