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I reckon it would support that and then some. I've had several kilos extending a foot and half out of mine without problems (two heavy 2" barlows + binoviewer + two Panoptics).
The only tricky bit is the brass compression ring. Under heavy load with a lot of torque it can slip and sag a little. But you'll probably find this with the more expensive units too. Beefy locking screws w/o a compression ring would be better - would be a straightforward modification if the compression ring was not good enough.
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