Step 1: Pieces you'll need
3 dark grey
2 red gears
2 or 3 blue spacers
7 grey spacers
Step 2: 2. putting it together
Step 3: 3. connecting the gears and motor onto the structure.
you also need to add chain and put some gears on the top which is the same except no motor is needed!
enjoy good luck on your ball machine :-D