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Ok, I'm responsible for combining the vacuum cleaner with the telescope.
I wanted to reverse the air flow within the tube but I did not want to have the fan hanging of the back and introduce vibrations. I was using a flimsy mount with the scope and it did not take much to get it vibrating.
The scope I'm using these days is larger, with enough mass to cope with 3 smaller fans mounted directly on the back plate.
Stefan
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