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It's difficult to answer. You get gradually more wobble and flex as you put more weight on a dob mount. Because the scope is designed for visual use it'd be hard to quote a weight limit. Depends on your tolerance for movement/vibration/etc.
It's easy to modify though when you think it's getting too sloppy and/or wobbly: reinforce the sides (extra buttresses work well). There are also effective AZ bearing kits available from ATM suppliers though I'm not sure if they can be used with a goto scope. And there is the old ebony star + teflon treatment that is a sure winner.
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