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I have a (modded) 40cm GSO Dobson with a more sturdy and narrower rockerbox (62x62cm) from plywood rather than the original particle board one and stiffer springs in the mirror cell.
I bought this scope second hand in a very good condition.
It has roller bearings (the original as well) which results in a very smooth motion, much better than the Orion XT-10. So keeping an object in the field even at high power (200x) is easy.
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