Quoted from docquest:
Been playing mine a lot today and so far just one issue and its driving me nuts. Ball couldnt get out of the crane scoop. After closer inspection I saw a screw in the bottom if the scoop. Ive combed over the entire playfield but cant figure out where the heck that screw came from.
Most likely one of the two screws holding the Batmobile on the round plastic piece. Stern used two washers, one under the car and another under the plastic. The screw is not long enough and both screws may fall out. Two things to do to correct the issue: 1. Use one washer under the car for each screw, discard the other. 2. Small amount of your favorite glue in the screw hole.