I hate giving one star to a product that is good except for one major flaw but nobody reads three star reviews. The nut that comes with the replacement filter will fail if the filter gains some weight during use. If you vacuum something in this case, you'll end up with a dust storm and a mess. Luckily I kept the original threaded nut, which works great. If you do not have the original, you will need to order a suggested replacement wing nut from Sears. This will save you a lot of hassle.