Thank you ladies! I do have the L brackets, I'm just waiting for hubby to get/give me a board to screw them to.
I forgot to pick up elastic when we were out (I looked and was going to go back to get it-my son decided it was time to go home to get a nap
I didn't even make it to look at any thread.
So I guess whatever I decide to use I will just have to make sure it is tied really tight?