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Been a while since I did any imaging but I had, among other stuff, an 80mm SV triplet - quite heavy for its size -as a guide scope riding atop my Mak. I experienced no deformation despite the tube being thinner than most other compound 'scopes(weight saving apparently).
From memory - examining one in the shop - I would think you could mount almost anything up to about 7kg atop the GSO, without experiencing any ill effects.
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