Must be a problem with them, it happened to me too. I've already replaced it, but it was pricey for what it is.....a weird shaped washer. As a temp fix until it came in, I used a regular washer and a rubber grommet.....the kind you use for the bottom of table legs. It worked very well, but was not pretty. I was glad when three months later the aluminum jobby came in. The cycle shop didn't charge me for it once they realized how long it took to come in. I was glad for that.
I saw some on e-slay that looked pretty good. They were the "washer" as well as a bungee grab on. I'm going to check out the COO ones you guys are talking about. What's the average price range?