How do I get a spring back into a trundle bed?
I have an old twin-size futon and it folds up nicely and is small. The problem is that the mattress doesn't fold in half like most futons, but instead folds down to the floor. It also has a very uncomfortable coil type of mattress with no memory foam or anything. So how can I make this thing useable as a trundle bed when my husband travels for work?