After getting nearly zero grounds I discovered this page and ordered the part. I just received and installed the new impeller on my 600. Installation went smoothly and it seemed to fit properly without any sanding or filing. After reassembly I put in normal medium dark beans and started it on coarse (60). The grounds seemed to flow nicely until I turned the dial. The grounds slowed and weren't flowing consistently. The more I turn it towards fine ground it gets worse. I cannot get ANY fine grounds or much of anything even lower than French press setting(40). I switched to a lighter bean and still no improvement. The grinder has never had any problems with dark or oily beans, let alone medium. I disassembled and reassembled the unit 2 more times, tightening/loosening the bottom burr to make sure it was seated correctly and washing impeller to prevent static, to no affect. Any input would be appreciated as this purchase did not fix the problem… I use the grinder for espresso between settings 10 and 20.
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