The actuator is awesome. It functioned as it should. The spindle slot is large enough to have the spindle from damper connected and tightened. The arrows on the plastic bushing indicate movement and opening of the damper. Since it is not spring loaded, the reverse movement is by the third wire. Also, a small slider is available to rest the position at any given position. Happy to have made this purchase for a fraction of the price for a new actuator.