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Uncle Bulgaria · 3rd Jan 2020, 10:17 am

My 4000 is in bits so I can't test if it's a possibility, but have you considered play in the wheel spindles? Perhaps at a higher speed any eccentric rotation or lack of lubrication is exacerbated? What if you put a fresh rubber band over the wheel as a test?

3rd Jan 2020, 10:17 am	#5
Uncle Bulgaria Nonode Join Date: May 2016 Location: Cornwall, UK. Posts: 2,335	Re: Uher 4000 Report Monitor Noisy My 4000 is in bits so I can't test if it's a possibility, but have you considered play in the wheel spindles? Perhaps at a higher speed any eccentric rotation or lack of lubrication is exacerbated? What if you put a fresh rubber band over the wheel as a test?