Level 65 help!

This is driving me crazy!!! Does anyone know the solution to level 65 with the bucket by the box??? Thanks!

Connect weight to seesaw with rope, so it operates crossbow, balls will fall into bucket and pull it down. Blowtorch will then pop baloon, bucket will rest on conveyor.
Connect cable from battery to power disruptor, connect cable from solar cell to electric motor, and finally connect belt from electric motor to power disruptor. Good Luck