How do you pass World 7-3 Obsatcle in Super Monkey Ball 2?

The easiest way to beat obstacle is to ride the platform on the left side of the stage up to the top ledge. Next, from the high ledge, line yourself up with the slant at the bottom of the pillar and try to jump down on it. This should hit you with enough speed towards the pillar with the goal on it, to go up the pillar and through the underside of the goal.