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I've been using my Chicago brand rotary tool for a project requiring sanding. After a while there started to be a grinding noise from the motor. Like something gritty was in the motor. I assumed it was a build up of saw dust in the casing around the motor so I would blow the dust out and the noise would stop. I thought the problem was solved. Eventually it got to a point where blowing the vents out didn't help. I was worried I'd burn out the motor if I didn't fix it. I unplugged it (safety first!) and opened the casing. As I suspected there was some build up inside the tool. I proceeded to blow it out as well as I could. Once back together I turned it on. The grinding noise is gone but the motor's general sound it makes has changed. It's higher pitched then before. Not really a whine but definitely different then it was before. I'm not sure what I did wrong. Nothing was moved when I had it opened. The best help I could find online said that it may need oiled, but it sounded normal before I opened it (besides the grinding noise). Does anyone know what it might be?