To use a servo reverser or not. While the convenience of a servo reverser is quite appealing but there are some instances where space, weight or logistics don't allow from the easy of a reversing module. The attached video will step you through reversing one internally. I have shown this on a 9G servo but the principle applies to all sizes. Don't let the intimidation of opening up electronics detour you, it's quite a simple process. The basis is reversing the positive and signal line as well as the positive and neutral on the servo motor. Good Luck and hope this helps.