U search some old post, use keyword "4WS"
Some brands of servo are in opposite direction, so if you use the same servo, both will move to same direction
And, some guys memtioned that to cut and re-connect the cables of Servo, as I know, is is useless / not in use...
Under that Ching what I want to fix it I have got in hand, if not I will prefer fix it back to normal. Anyway thanks for those available information to me