I bought a couple Dynam planes and was pleased to see that the Y harnesses were included. One of them would only operate one servo but not the second servo. Slid the heat shrink tubing back to check out the connection and found only one of the sets of connector pins are soldered to the wire leads. The pins for the second servo are merely squeesed against the pins for the first servo and are held in place by the heat shrink tubing. Tried to solder them but that just melted the plastic pin mount. Obviously I replaced them with different y harnesses.