Level 41

Okay, advice from this forum got me through level 35, but now I'm stuck on Level 41. The crate keeps falling down the gap between the conveyors and I can't figure out any way to prevent it or to move it once it falls.

Hook a blue wire from the middle plug to the left plug.
Hook a belt from the main(big) pulley to the bottom right pulley.
Hook a belt from the left pulley to the top left conveyor pulley.
Hook a belt from the top right pulley to the right conveyor pulley.

It bounces the boxes all over the place, but finally they go off.

I didn't use the bucket or rope.