Originally Posted by
Loose rivets
I just can't get to grips with the concept of a weight. Counter-balance or not. My recollection of checking the vanes was that they stayed put to wherever you shoved them. Having any weight would make them subject to accelerative forces - the weight of the vane itself would be almost totally air-supported and while still affected by g, it would be minuscule compared to the pressure of the air.
If they were not balanced they would not stay put wherever you put them, so either the vane itself was balanced or there would need to be a separate internal counter balance.