Thanks for the replies guys, obviously there is no power setting. LTG, I tried bending the rail down, made no difference. A single ball enters the rail opening perfectly going nowhere near the bottom of the opening and riding the rail fine. If you watch my slow motion video you'll see that with 2 balls the 2nd ball hits straight into the bottom of the opening, both balls are trying to enter the rail opening at the same time, not one behind the other, so impossible. Is the catapult arm supposed to sit lower so the 2nd ball can get on top of the first? I've looked at the mechanism and looks fine.