How do you solve level 29 factory balls 3

1.Do the up and down belt
2.Put in blue
3.Take belt off
4.Put on side to side thin belt
5.Put in blue
6.Put back on up and down belt
7.Make it white
8.Take off up and down belt and put on thick belt
9.Make it white
10.Put on up and down belt
11.Put in blue
12.Take off belts