My wife mentioned that the Shark Rotator is really difficult to vacuum. I've tried it myself and it takes a good boost to move it, whereas it used to be self-propelled. I looked at the underside and checked the internet and decided the roller brush needed replacing. Shark didn't sell it, so after reading a bunch of reviews on which vacuums fit which, I ordered one for my NV522. I'm pretty comfortable, but it still took me about an hour to swap it out. Simply loosen a few screws, unscrew the drive motor housing to release the belt, then insert a new brush. My entire first floor has rough stone floors and in 3 years the roller brush has lost 2/3 the length of the brushes. . Now that I have a new reel hub this vacuum is super charged and pulls forward with ease. Do that!
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