I had a lot of trouble finding the right replacement brush for my Roomba 665. All the brushes I bought didn't fit (the hole to screw the brush in was too big and the brush fell off). I wrote to Neutop and quickly got a solution to my problem. I have sent photos of the brushes with hole sizes. Owen replied immediately and said they have brushes with smaller holes. He said my model was a special edition and actually needed 800 series brushes. Well it worked great and I received my brushes in two days. Customer service was excellent and they responded to my emails very quickly.
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