I looked up some reasons as to why it popped off (& kept coming off when bolt tightened...needed new agitator. Ordered it, and a new cap as I didn't play nice enough when taking off old one.) Watched the "how to" repair video. I was able to fix it in around 10 minutes. Used this site/company years ago with fridge water dispenser problems, so I knew the parts were good quality and videos are exactly the same as actual repair.