Len, another question I left out. Do use use some method to determin the stiff side of the spine on shafts (carbon in particular) and align the cock fletch accordingly? If so, how do you go about it? I have learned a simple and quick method for doing this and it seems to make a noticable difference in group size and number and extent of flyers. All of the limited brands and model shafts I have checked have shown a stiff and weaker side to some extent.