Interesting thing is that the blade itself doesn't seem to flex at all! So much so I have to wonder about the stability of the camera mounting apparatus. If it is in fact stable, which I suspect it is, then it would seem that ALL of the flex is at the base. Given that the fins I've seen snapped off broke at the base, I suspect that's true.
Leads to the question - are fins overbuilt on the blade, but underbuilt at the junction of the base and blade?