RE: Skymaster L39 Elevator servo
Hello,
I have a SM L 39 with JR DS 9401 (or JR 9411 for the US) for the elevators which fits perfectly and has much more torque than JR 3421.Besides, I think JR 9301(plastic gear version of 9411) is bigger than JR 3421.
Best regards and merry Xmas.