When does the ball light change?(When sweep starts to sweep away dead wood/pins, when sweep starts to go back up to home, or when the sweep gets to the home position)
It is the 2 red lights(or white, depending on the model of the masking unit) on the opposite side of the lane number, just a bit to the left of where the camera cut off.
82-90 with white sweep it exists ;-) And look, the sweep arms are in plastic, metal on 82-70. Afterwards, the sound of the pinwheel look like 82-90 and the respot bars on the table are from 70's ...
