Again - the problem with a shorter bar... is extra weight. We're trying to keep that to an absolute minimum. Flex isn't an issue - we don't have 20 or 30 pounds dangling off the end.
Greg's is easy to make of you have access to a lathe and mill. It's what I would have done too. The way he has it, the weight is positioned well back towards the back of the unit too so that the camera's COG and Polarie bearing are on the same plane.
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