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One thing to keep in mind folks between the Al and the CF tube is only maybe a few grams in weight. Expansion is no real difference because the primary cell and secondary spider are in fact connected by 2 big Al slabs as in the losmandy plates or at least they were in the 10" model.
I doubt there would be 1 Kg of difference between the CF and epoxy model and the Alumin tubed model.
The 10" was as big as you would want to go on a G11 particularly if you are going to use a guide scope of any size.
Good luck with it Paul. Look forward to seeing your results.
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