I bought this a while ago and used it once two years ago. It worked fine on the first try, but I couldn't fold it back into a container. I think something inside has shifted. So basically I had to manually paste it back in. Today I tried to use it again. It was all twisted and rusty when I pulled it out of the blue case with my hands. Please fix the mechanism. I assumed you could use the handle to roll and flip it, but I was clearly wrong. I assume this is a one time thing?