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rc 8
I had a metal tube Rc 8 and a CF Rc 10, both of which I placed a 110mm refractor on the top and sometimes a small guide scope mini guider on the top of that. I used an OAG with the Rc 10 but not with the rc 8. I never noticed any change in star shapes that would you expect from weight deforming the tube, i.e pointing at different parts of the sky.
I think if the weight is spread and well balanced you will be OK.
Graz
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