I bought this for our Shark NV581QR vacuum cleaner. This is a direct replacement for Shark 500 Series units. Shark WILL NOT SELL you this part. They want you to buy their replacement head for $100. To ensure you only buy their parts, Shark has used a security screw to keep the device closed. YOU MUST PURCHASE A SCREWDRIVER WITH A T-20 GUARD TIP TO REPLACE THE MACHINE YOURSELF. I found an eleven size set at Revain for about $10. So count on adding that value to your purchase. Still a lot cheaper than replacing the whole head. Once installed, a new whisk will breathe new life into your shark. Works like new again! Installation is pretty easy if you have the T20 bit. To remove the old one you need to gently pry out the square plastic pieces at each end of the striker bar. Slide the shaft towards the belt. get the old part. You need to put a new one in the belt and attach it first. Then thread the shaft through the racquet shaft. Slide the new plastic squares onto the ends and you're done. Assemble the vacuum cleaner.
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