I started ripping one out that just wasn't working, and gave it up as a waste of time. All of the fabric was a 'cheaper' brand that ripping it out just made a mess of it. After painstakingly ripping/taking apart three or four blocks, I just tossed the whole thing and never looked back. It was a waste of money (not a lot) but still money, so I hesitated and put it in time out for a few hours, but the more I thought about it, the more I knew I wouldn't use it again and tossed all of it that same day.