Setting up bench with bands???

[Killerls1]

Ok I recently purchased some bands to use for benching. My question is how the hell do I set them up on the bench. Like first I tried strapping them to a 100lbs dumbells, but they rolled around. Then i strapped it to the lower part of the bench, and i doubled the straps on the bar five times, but like it still didnt feel like it was doing much. What is the proper way to set this stuff up, and are there any sites that have pictures of the setup. Thanks bros.

[meat12]

here is a website that may help, aslo i recently purchased a book called the great strech tubing handbook you can find it on amazon for like 14 bucks

http://www.besthomeexerciseequipment.com/exercises.html