You are right Dan. The lady at BHSS told me about that. You need a right offset so that little tab can hit the wind and spin it more. At least I think it is called right. When I look at it from above the tip of the vane is pointed to right and the back or nock end is on the left. They work good and I like them. But when I see Dave's groups and here you talk about yours I do not know if what I am getting is worth it. They are pretty pricey!!