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Ray, James:
Thank you so much for all the kindness and technical tips.
Actually I am doing all the work with the scope horizontal, so it makes sense that once the primary mirror rocks on its base, the collimation trends to change.
For while I will try to stabilize the mirror using silicone as you directed. I don't want to drill holes on the cell to add some screws, because if I decide not to keep the scope I have to send it back as an original unit.
Among the procedures you recomended, one is from the Glatter's website, which is the one I have been following. The only part I skipped was the one that check and adjust the centering of the focuser and its orthogonality to the optical axis of the primary mirror. It might have been a mistake and I will have to do it.
Ray, when I said that looking through the Cheshire everything looks different, I ment that laser, autocollimator and Chishare, all indicated to a good collimation, but when the scope was pointed to a star, well a total s##%%t star pattern. But now there is a new perspective: I moved the scope from horizontal to vertical. One more detail: my star test showed me a uncollimated star pattern, not a pattern corrupted by tube currents.
OK, now having all the information that you guys gave me I will try a couple of things. I will post in this thread what I get.
Thank you very very much for all the help,
Fernando
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