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Humayun,
I know what you mean about the centre of gravity and that's why I've persisted with the SBS setup. There is just too much weight in the 10" newt for me to contemplate stacking the guide scope on top. I've swapped the vixen system out for losmandy D bars and plates with the starstuff SBS bar and while the flexure is not gone it is better than it was before. I've swapped the guide scope and tried my ED80 as a guide scope and still get some movement so it's likely the remaining flexure is in the 10" newt. I need to have a look at how the primary mirror is mounted as it's possible there's some movement of the mirror in the cell.
Peter
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