I almost broke it once we got home. They removed the glass balls and packed up all the pieces separately. By the time we got back, I guess the heat had expanded the glass a little, so the larger ball would not slide into the base.
I tried cooling it down, but it still wouldn't go in. Eventually, I took a gamble, and shoved hard. Luckily, it worked. But those balls are never coming out of that wood again.