Stuck on level 20

please help if you know how to solve level 20. Thanks

Yep, use the steel ball and magnet to prevent the lower billiard balll from moving. Then it will not hit the switch so the C4 will not explode, the ball will just run over the C4 and straight into the bucket.

Got it, thank you for your help..

Amazing how easy it is...I tried about anything with every tool, even tried the magnet on the billiard ball, but not on the steel ball.....duhhhhh
Thanks alot for the help!

Yes, you do'nt think of the easy answer at first, because you have all that equipment there to set up a conveyor belt, so you assume you need the conveyor belt as part of the solution, No! Red Herring!!