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Hi Leo and Greg,
Yes, 7.5kg is too big!
The Gemini rotator is quite heavy to start with. Then adding the Starlight Xpress SX -46 and large FW add quite a lot, plus Josh's clever tilt cage and conterweight and reinforcement of the flexing SX FW, plus a featherTouch 1.25" motorized focuser on the guide camera, produced a weight the original flange just couldn't cope with. It is a pity it took so long for me to think of it as a contributor to the problem. It's just something one assumes will not be a problem!
The Gemini remains the weakest link in the system. Hopefully moving the flattener inside the focuser will reduce the moment of all this gear enough tio finally get this under control.
P
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