Motor Clockwise for 10 sec, stop for 1 sec, counterclockwise for 10 seconds , stop

Inside dia. of ball about 4 cm? The servo still fits with small reel but needs a pulley- roller to direct the string.
A simple sw. can be made from a sandwich of self stick copper foil, a layer of conductive foam like IC are shipped in, another layer of copper foil with a wire to inside of the ball. A 470 k resistor is connected to outer foam layer & Vcc; junction connected to an available IC- MC -comparator as a high. When hitting table, V drops to a logic lo triggering a stop signal.