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It's probably that the shop that sells the Dob does not have a good enough EQ mount to handle a 10" f/5 Newt. Have a look at Bird's scope (in last issue of AS&T). It's a 13" monster Newt and it is rock solid on an EQ mount. Look at the awesome images Bird takes with it!
Flex? Maybe they mean in the steel tube itself rather than the mount? But I find that very hard to believe and that too can be solved with good set of tube rings and maybe some bracing.
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