Hi Rob, thanks for your feedback on the S 650 Sweeper. It sounds like you have found a great way to troubleshoot using this machine in problem areas such as up against grass. I will definitely take this feedback to our product management team so that they have a better idea of how customers are using this machine and what can be improved in the future. If you ever have any questions regarding your machine, or need to replace the brush on this unit, please give us a call at 800-537-4129 and one of our agents would be happy to assist. Happy cleaning, Karl from the Customer Care Team.