On Tue, Apr 6, 2021 at 08:20 PM, Siggi wrote:
Rather than going this way, you might try to re-lube the motor. On my 485,
which had a horribly noisy & rattling fan, I did this successfully.
In 465/475 family 'scopes, I've encountered a few motors with worn-out sintered bronze bearings, causing a very unpleasant rumbling noise. I could clearly feel the radial play, mostly in one direction. Fortunately, I had a few donors available, which I treated mostly the way you suggest.
Raymond
Raymond Domp Frank