Labily Escape Box

Should you try to open this box for Billy ?

If you look - or listen - you'll see a small metal ball between the engraving holes.
And if you can just get the ball to the right place, you'll release the wooden part that locks the box.

But where is the right place? And how do you get the ball there?
You'll have to discover that for yourself.

Even if you solved the box once, twice or dozens of times
You will have to make an effort each time to complete the entire route to reach the solution.

Do we need the solution?