Check out: https://m.youtube.com/watch?v=kQeDnFUNW-Q https://m.youtube.com/watch?v=kQeDnFUNW-Q And gate starts at 4:49. Or gate starts at 6:27. The trick is to

Check out: https://m.youtube.com/watch?v=kQeDnFUNW-Q https://m.youtube.com/watch?v=kQeDnFUNW-Q And gate starts at 4:49. Or gate starts at 6:27. The trick is to make some gears not stationary, moving along as other gears push them.