Quoted from FrankyP:Just to make sure im clear when the captive ball releases right then the bonus should score and reset even before the ball hits outhole sensor? Switches in trough are clean and making contact. The springs on those arms do spring back in place but they are definitely what i would call very springy if thats a word.
When the captive ball releases, the game will score the built up bonus. During the same ball count, you will also collect the bonus when the ball(s) drain. The main strategy for high scores is to lock a ball, build up bonus and release and re-lock the captive ball as many times as possible.
It happens at 1:30 in this video...the ball is unlocked and you can hear 6000 points scored.